Basic leucine zipper (bZIP) domain of X-box binding protein 1 (XBP1) and similar proteins: a DNA-binding and dimerization domain; XBP1, a member of the Basic leucine zipper (bZIP) family, is the key transcription factor that orchestrates the unfolded protein response (UPR). It is the most conserved component of the UPR and is critical for cell fate determination in response to ER stress. The inositol-requiring enzyme 1 (IRE1)-XBP1 pathway is one of the three major sensors at the ER membrane that initiates the UPR upon activation. IRE1, a type I transmembrane protein kinase and endoribonuclease, oligomerizes upon ER stress leading to its increased activity. It splices the XBP1 mRNA, producing a variant that translocates to the nucleus and activates its target genes, which are involved in protein folding, degradation, and trafficking. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*..
gi 13775156  63 EEKALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGL 119
Cdd:cd14691   1 EEKDLRRKLKNRVAAQTARDRKKARMDELEERVRELEEENQKLRAENESLRARNEDL 57

Basic leucine zipper (bZIP) domain of X-box binding protein 1 (XBP1) and similar proteins: a DNA-binding and dimerization domain; XBP1, a member of the Basic leucine zipper (bZIP) family, is the key transcription factor that orchestrates the unfolded protein response (UPR). It is the most conserved component of the UPR and is critical for cell fate determination in response to ER stress. The inositol-requiring enzyme 1 (IRE1)-XBP1 pathway is one of the three major sensors at the ER membrane that initiates the UPR upon activation. IRE1, a type I transmembrane protein kinase and endoribonuclease, oligomerizes upon ER stress leading to its increased activity. It splices the XBP1 mRNA, producing a variant that translocates to the nucleus and activates its target genes, which are involved in protein folding, degradation, and trafficking. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*..
gi 13775156  63 EEKALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGL 119
Cdd:cd14691   1 EEKDLRRKLKNRVAAQTARDRKKARMDELEERVRELEEENQKLRAENESLRARNEDL 57

bZIP Maf transcription factor; Maf transcription factors contain a conserved basic region leucine zipper (bZIP) domain, which mediates their dimerization and DNA binding property. Thus, this family is probably related to pfam00170. This family also includes the DNA_binding domain of Skn-1, this domain lacks the leucine zipper found in other bZip domains, and binds DNA is a monomer.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 13775156    54 RQRLTHLSPEE----KALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGLVVENQELR 127
Cdd:pfam03131  15 NRFLRGLTEEEvirlKQRRRRLKNRGYAQSCRKRRLQQKESLEKERSELREQLERLVQELSRLRQELDALKRRNEQLQ 92

Regulator of replication initiation timing YabA [Replication, recombination and repair];

                        10        20
                ....*....|....*....|....*...
gi 13775156  88 MSELEQQVVDLEEENHKLQLENQLLREK 115
Cdd:COG4467  24 LGELKDEVAELLEENARLRIENEHLRER 51

Basic leucine zipper (bZIP) domain of X-box binding protein 1 (XBP1) and similar proteins: a DNA-binding and dimerization domain; XBP1, a member of the Basic leucine zipper (bZIP) family, is the key transcription factor that orchestrates the unfolded protein response (UPR). It is the most conserved component of the UPR and is critical for cell fate determination in response to ER stress. The inositol-requiring enzyme 1 (IRE1)-XBP1 pathway is one of the three major sensors at the ER membrane that initiates the UPR upon activation. IRE1, a type I transmembrane protein kinase and endoribonuclease, oligomerizes upon ER stress leading to its increased activity. It splices the XBP1 mRNA, producing a variant that translocates to the nucleus and activates its target genes, which are involved in protein folding, degradation, and trafficking. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*..
gi 13775156  63 EEKALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGL 119
Cdd:cd14691   1 EEKDLRRKLKNRVAAQTARDRKKARMDELEERVRELEEENQKLRAENESLRARNEDL 57

Basic leucine zipper (bZIP) domain of bZIP transcription factors: a DNA-binding and dimerization domain; Basic leucine zipper (bZIP) factors comprise one of the most important classes of enhancer-type transcription factors. They act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes including cell survival, learning and memory, lipid metabolism, and cancer progression, among others. They also play important roles in responses to stimuli or stress signals such as cytokines, genotoxic agents, or physiological stresses. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|
gi 13775156  66 ALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREK 115
Cdd:cd14686   1 KERRRERNREAARRSRERKKERIEELEEEVEELEEENEELKAELEELRAE 50

bZIP Maf transcription factor; Maf transcription factors contain a conserved basic region leucine zipper (bZIP) domain, which mediates their dimerization and DNA binding property. Thus, this family is probably related to pfam00170. This family also includes the DNA_binding domain of Skn-1, this domain lacks the leucine zipper found in other bZip domains, and binds DNA is a monomer.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 13775156    54 RQRLTHLSPEE----KALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGLVVENQELR 127
Cdd:pfam03131  15 NRFLRGLTEEEvirlKQRRRRLKNRGYAQSCRKRRLQQKESLEKERSELREQLERLVQELSRLRQELDALKRRNEQLQ 92

bZIP transcription factor; The Pfam entry includes the basic region and the leucine zipper region.

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 13775156    65 KALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGLVVEN 123
Cdd:pfam00170   1 KREKRKQSNREAARRSRQRKQAYIEELERRVKALEGENKTLRSELEELKKEVEKLKSKN 59

Basic leucine zipper (bZIP) domain of Cyclic AMP-responsive element-binding protein-like 2 (CREBL2): a DNA-binding and dimerization domain; CREBL2 is a bZIP transcription factor that interacts with CREB and plays a critical role in adipogenesis and lipogenesis. Its overexpression upregulates the expression of PPARgamma and CEBPalpha to promote adipogenesis as well as accelerate lipogenesis by increasing GLUT1 and GLUT4. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|.
gi 13775156  69 RKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGL 119
Cdd:cd14709   5 KLERNRQSARESRDRKKLRYQYLEQLVADREREILLLREELEMYKQWCEEL 55

Basic leucine zipper (bZIP) domain of Cyclic AMP-responsive element-binding protein 1 (CREB1) and similar proteins: a DNA-binding and dimerization domain; CREB1 is a Basic leucine zipper (bZIP) transcription factor that plays a role in propagating signals initiated by receptor activation through the induction of cAMP-responsive genes. Because it responds to many signal transduction pathways, CREB1 is implicated to function in many processes including learning, memory, circadian rhythm, immune response, and reproduction, among others. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|.
gi 13775156  65 KALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREK 115
Cdd:cd14690   1 KRQLRLEKNREAARECRRKKKEYVKCLENRVAVLENENKELREELKILKEL 51

Basic leucine zipper (bZIP) domain of Activating Transcription Factor-6 (ATF-6) and similar proteins: a DNA-binding and dimerization domain; ATF-6 is a type I membrane-bound Basic leucine zipper (bZIP) transcription factor that binds to the consensus ER stress response element (ERSE) and enhances the transcription of genes encoding glucose-regulated proteins Grp78, Grp94, and calreticulum. ATF-6 is one of three sensors of the unfolded protein response (UPR) in metazoans; the others being the kinases Ire1 and PERK. It contains an ER-lumenal domain that detects unfolded proteins. In response to ER stress, ATF-6 translocates from the ER to the Golgi with simultaneous cleavage in a process called regulated intramembrane proteolysis (Rip) to its transcriptionally competent form, which enters the nucleus and upregulates target UPR genes. The three UPR sensor branches cross-communicate to form a signaling network. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|....*..
gi 13775156  69 RKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREK 115
Cdd:cd14700   4 RMIKNRESACLSRKKKKEYVQSLETKLEQLKQENQKLKSENETLRER 50

Basic leucine zipper (bZIP) domain of Fungal HAC1-like transcription factors: a DNA-binding and dimerization domain; HAC1 (also called Hac1p or HacA) is a bZIP transcription factor that plays a critical role in the unfolded protein response (UPR). The UPR is initiated by the ER-resident protein kinase and endonuclease IRE1, which promotes non-conventional splicing of the HAC1 mRNA, facilitating its translation. HAC1 binds to and activates promoters of genes that encode chaperones and other targets of the UPR. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|....*....
gi 13775156  69 RKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTH 117
Cdd:cd14710   5 RILRNRRAAHQSRERKRLHVEFLEKKCDLLEALLQRLQDLLAQLEEKLA 53

DNA replication initiation control protein YabA;

                         10        20
                 ....*....|....*....|....*...
gi 13775156   88 MSELEQQVVDLEEENHKLQLENQLLREK 115
Cdd:PRK13169  24 LGALKKQLAELLEENTALRLENDKLRER 51

Basic leucine zipper (bZIP) domain of blue light (BL) receptor aureochrome (AUREO) and similar bZIP domains; AUREO is a BL-activated transcription factor specific to phototrophic stramenopiles. It has a bZIP and a BL-sensing light-oxygen voltage (LOV) domain. It has been shown to mediate BL-induced branching and regulate the development of the sex organ in Vaucheria frigida. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription. This subgroup also includes the Epstein-Barr virus (EBV) immediate-early transcription factor ZEBRA (BZLF1, Zta, Z, EB1). ZEBRA exhibits a variant of the bZIP fold, it has a unique dimer interface and a substantial hydrophobic pocket; it has a C-terminal moiety which stabilizes the coiled coil involved in dimer formation. ZEBRA functions to trigger the switch of EBV's biphasic infection cycle from latent to lytic infection. It activates the promoters of EBV lytic genes by binding ZEBRA response elements (ZREs) and inducing a cascade of expression of over 50 viral genes. It also down regulates latency-associated promoters, is an essential replication factor, induces host cell cycle arrest, and alters cellular immune responses and transcription factor activity.

                        10        20        30
                ....*....|....*....|....*....|....*...
gi 13775156  68 RRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKL 105
Cdd:cd14809   3 RRRERNREHARKTRLRKKAYLESLKEQVAALQAENQRL 40

Regulator of replication initiation timing YabA [Replication, recombination and repair];

                        10        20
                ....*....|....*....|....*...
gi 13775156  88 MSELEQQVVDLEEENHKLQLENQLLREK 115
Cdd:COG4467  24 LGELKDEVAELLEENARLRIENEHLRER 51

Basic leucine zipper (bZIP) domain of Plant RF2-like transcription factors: a DNA-binding and dimerization domain; This subfamily is composed of plant bZIP transciption factors with similarity to Oryza sativa RF2a and RF2b, which are important for plant development. They interact with, as homodimers or heterodimers with each other, and activate transcription from the RTBV (rice tungro bacilliform virus) promoter, which is regulated by sequence-specific DNA-binding proteins that bind to the essential cis element BoxII. RF2a and RF2b show differences in binding affinities to BoxII, expression patterns in different rice organs, and subcellular localization. Transgenic rice with increased RF2a and RF2b display increased resistance to rice tungro disease (RTD) with no impact on plant development. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|....*..
gi 13775156  67 LRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLR 113
Cdd:cd14703   2 AKRILANRQSAQRSRERKLQYISELERKVQTLQTEVATLSAQLALLE 48

Basic leucine zipper (bZIP) domain of Cyclic AMP-responsive element-binding protein 3 (CREB3) and similar proteins: a DNA-binding and dimerization domain; This subfamily is composed of CREB3 (also called LZIP or Luman), and the CREB3-like proteins CREB3L1 (or OASIS), CREB3L2, CREB3L3 (or CREBH), and CREB3L4 (or AIbZIP). They are type II membrane-associated members of the Basic leucine zipper (bZIP) family of transcription factors, with their N-termini facing the cytoplasm and their C-termini penetrating through the ER membrane. They contain an N-terminal transcriptional activation domain followed bZIP and transmembrane domains, and a C-terminal tail. They play important roles in ER stress and the unfolded protein response (UPR), as well as in many other biological processes such as cell secretion, bone and cartilage formation, and carcinogenesis. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 13775156  65 KALRRKLKNRVAAQTARDRKKARMSELEQQVvdleeenHKLQLENQLLREKTHGLVVENQELRTRL 130
Cdd:cd14689   2 KKVRRKIRNKISAQESRRRKKEYIDGLESRV-------AACTAENQELKKKVEELEKQNRSLLSQL 60

Basic leucine zipper (bZIP) domain of Activating Transcription Factor-4 (ATF-4) and similar proteins: a DNA-binding and dimerization domain; ATF-4 was also isolated and characterized as the cAMP-response element binding protein 2 (CREB2). It is a Basic leucine zipper (bZIP) transcription factor that has been reported to act as both an activator or repressor. It is a critical component in both the unfolded protein response (UPR) and amino acid response (AAR) pathways. Under certain stress conditions, ATF-4 transcription is increased; accumulation of ATF-4 induces the expression of genes involved in amino acid metabolism and transport, mitochondrial function, redox chemistry, and others that ensure protein synthesis and recovery from stress. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|..
gi 13775156  64 EKALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLE-NQLLRE 114
Cdd:cd14692   1 EKKERKREQNKNAATRYRQKKREEKEELLSEEEELEDRNRELKDEvEELQRE 52

Basic leucine zipper (bZIP) domain of small musculoaponeurotic fibrosarcoma (Maf) proteins: a DNA-binding and dimerization domain; Maf proteins are Basic leucine zipper (bZIP) transcription factors that may participate in the activator protein-1 (AP-1) complex, which is implicated in many cell functions including proliferation, apoptosis, survival, migration, tumorigenesis, and morphogenesis, among others. Maf proteins fall into two groups: small and large. The small Mafs (MafF, MafK, and MafG) do not contain a transactivation domain but do harbor the anxillary DNA-binding domain and a C-terminal bZIP domain. They form dimers with cap'n'collar (CNC) proteins that harbor transactivation domains, and they act either as activators or repressors depending on their dimerization partner. CNC transcription factors include NFE2 (nuclear factor, erythroid-derived 2) and similar proteins NFE2L1 (NFE2-like 1), NFE2L2, and NFE2L3, as well as BACH1 and BACH2. Small Mafs play roles in stress response and detoxification pathways. They also regulate the expression of betaA-globin and other genes activated during erythropoiesis. They have been implicated in various diseases such as diabetes, neurological diseases, thrombocytopenia and cancer. Triple deletion of the three small Mafs is embryonically lethal. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*
gi 13775156  65 KALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGL 119
Cdd:cd14717   8 KQRRRTLKNRGYAASCRIKRVTQKEELEKQKAELQQEVEKLARENASMRLELDAL 62

Basic leucine zipper (bZIP) domain of Nuclear factor interleukin-3-regulated protein (NFIL3): a DNA-binding and dimerization domain; NFIL3, also called E4 promoter-binding protein 4 (E4BP4), is a Basic leucine zipper (bZIP) transcription factor that was independently identified as a transactivator of the IL3 promoter in T-cells and as a transcriptional repressor that binds to a DNA sequence site in the adenovirus E4 promoter. Its expression levels are regulated by cytokines and it plays crucial functions in the immune system. It is required for the development of natural killer cells and CD8+ conventional dendritic cells. In B-cells, NFIL3 mediates immunoglobulin heavy chain class switching that is required for IgE production, thereby influencing allergic and pathogenic immune responses. It is also involved in the polarization of T helper responses. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|
gi 13775156  68 RRKlKNRVAAQtaRDRKKARMSE--LEQQVVDLEEENHKLQLENQLLREK 115
Cdd:cd14694   8 KRR-KNNEAAK--RSREKRRLNDlvLENRILELTEENAVLRAELAALKRR 54

Basic leucine zipper (bZIP) domain of CREBZF/Zhangfei transcription factor and similar proteins: a DNA-binding and dimerization domain; CREBZF (also called Zhangfei, ZF, LAZip, or SMILE) is a neuronal bZIP transcription factor that is involved in the infection cycle of herpes simplex virus (HSV) and related cellular processes. It suppresses the ability of the HSV transactivator VP16 to initiate the viral replicative cycle. CREBZF has also been implicated in the regulation of the human nerve growth factor receptor trkA and the tumor suppressor p53. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40
                ....*....|....*....|....*....|....*....|..
gi 13775156  72 KNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLR 113
Cdd:cd14706   7 KNAIAARENRLKKKEYVENLEKSVDKLKSENKELKKANKKLQ 48

Basic leucine zipper (bZIP) domain of CCAAT/enhancer-binding protein delta (CEBPD): a DNA-binding and dimerization domain; CEBPD is an inflammatory response gene that is induced by Toll-like receptor 4 (TLR4) and is essential in the expression of many lipopolysaccharide (LPS)-induced genes and the clearance of bacterial infection. Its expression is increased in response to various extracellular stimuli and it induces growth arrest and apoptosis in cancer cells. It is thought to function as a tumor suppressor and its expression is found reduced by site-specific methylation in many cancers including breast, cervical, and hepatocellular carcinoma. CEBPs (or C/EBPs) are Basic leucine zipper (bZIP) transcription factors that regulate many cellular processes. There are six CEBP proteins in mammalian cells including CEBPA (alpha), CEBPB (beta), CEBPG (gamma), CEBPD (delta), and CEBPE (epsilon), which all contain highly conserved bZIP domains at their C-termini and variations at their N-terminal regions. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|....*
gi 13775156  61 SPEEKalRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKL-QLENQLLRE 114
Cdd:cd14714   4 SPEYR--QRRERNNIAVRKSRDKAKRRNQDMQQKLLELSAENEKLhKKIEQLTRD 56

Basic leucine zipper (bZIP) domain of uncharaterized Plant BZIP transcription factors: a DNA-binding and dimerization domain; This subfamily is composed of uncharacterized plant bZIP transciption factors with similarity to Glycine max BZIP46, which may be a drought-responsive gene. Plant bZIPs are involved in developmental and physiological processes in response to stimuli/stresses such as light, hormones, and temperature changes. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

                        10        20        30        40        50
                ....*....|....*....|....*....|....*....|....*....|.
gi 13775156  68 RRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKL--QLENQLLREKT 116
Cdd:cd14707   4 RRMIKNRESAARSRARKQAYTNELELEVAHLKEENARLkrQQEELLLALAA 54

Basic leucine zipper (bZIP) domain of CCAAT/enhancer-binding protein beta (CEBPB): a DNA-binding and dimerization domain; CEBPB is a key regulator of metabolism, adipocyte differentiation, myogenesis, and macrophage activation. It is expressed as three distinct isoforms from an intronless gene through alternative translation initiation: CEBPB1 (or liver-enriched activator protein 1, LAP1); CEBPB2 (OR LAP2); and CEBPB3 (or liver-enriched inhibitory protein, LIP). LAP1/2 function as transcriptional activators while LIP is a repressor due to its lack of a transactivation domain. The relative expression of LAP and LIP has effects on inflammation, ER stress, and insulin resistance. CEBPs (or C/EBPs) are Basic leucine zipper (bZIP) transcription factors that regulate many cellular processes. There are six CEBP proteins in mammalian cells including CEBPA (alpha), CEBPB (beta), CEBPG (gamma), CEBPD (delta), and CEBPE (epsilon), which all contain highly conserved bZIP domains at their C-termini and variations at their N-terminal regions. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

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                ....*....|....*....|....*....|....*....|....*....|...
gi 13775156  63 EEKALRRKlKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLE-NQLLRE 114
Cdd:cd14712   9 DEYKIRRE-RNNIAVRKSRDKAKMRNLETQHKVLELTAENERLQKKvEQLSRE 60

Basic leucine zipper (bZIP) domain of BTB and CNC homolog (BACH) proteins: a DNA-binding and dimerization domain; BACH proteins are Cap'n'Collar (CNC) Basic leucine zipper (bZIP) transcription factors that are defined by a conserved 43-amino acid region (called the CNC domain) located N-terminal to the bZIP DNA-binding domain. In addition, they contain a BTB domain (Broad complex-Tramtrack-Bric-a-brac domain, also known as the POZ [poxvirus and zinc finger] domain) that is absent in other CNC proteins. Veterbrates contain two members, BACH1 and BACH2. BACH1 forms heterodimers with small Mafs such as MafK to function as a repressor of heme oxygenase-1 (HO-1) gene (Hmox-1) enhancers. It has also been implicated as the master regulator of breast cancer bone metastasis. The BACH1 bZIP transcription factor should not be confused with the protein originally named as BRCA1-Associated C-terminal Helicase1 (BACH1), which has been renamed BRIP1 (BRCA1 Interacting Protein C-terminal Helicase1) and also called FANCJ. BACH2 is a B-cell specific transcription factor that plays a critical role in oxidative stress-mediated apoptosis. It plays an important role in class switching and somatic hypermutation of immunoglobulin genes. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

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                ....*....|....*....|....*....|....*....|....*....|....*....|
gi 13775156  67 LRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKL-----QLENQL--LREKTHGL 119
Cdd:cd14719  11 VRRRSKNRIAAQRCRKRKLDCIQNLECEIKKLVCEKEKLlgernQLKASMgeLRENFSCL 70

Basic leucine zipper (bZIP) domain of Activating Transcription Factor-3 (ATF-3) and similar proteins: a DNA-binding and dimerization domain; ATF-3 is a Basic leucine zipper (bZIP) transcription factor that is induced by various stress signals such as cytokines, genetoxic agents, or physiological stresses. It is implicated in cancer and host defense against pathogens. It negatively regulates the transcription of pro-inflammatory cytokines and is critical in preventing acute inflammatory syndromes. Mice deficient with ATF3 display increased susceptibility to endotoxic shock induced death. ATF3 dimerizes with Jun and other ATF proteins; the heterodimers function either as activators or repressors depending on the promoter context. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

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                ....*....|....*....|....*....|....*....|....*....|....
gi 13775156  68 RRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGLVV 121
Cdd:cd14722   4 RRRERNKVAAAKCRNKKKERTDCLQKESEKLETQNAELKRQIEELKNEKQHLID 57

Basic leucine zipper (bZIP) domain of CCAAT/enhancer-binding protein epsilon (CEBPE): a DNA-binding and dimerization domain; CEBPE is a critical regulator of terminal granulocyte differentiation or granulopoiesis. It is expressed only in myeloid cells. Mice deficient with CEBPE are normal at birth and fertile, but they do not produce normal neutrophils or eosinophils, and show impaired inflammatory and bacteriocidal responses. Functional loss of CEBPE causes the rare congenital disorder, Neutrophil-specific granule deficiency (SGD), which is characterized by patients' neutrophils with atypical nuclear morphology, abnormal migration and bactericidal activity, and the lack of specific granules. Patients with SGD suffer from severe and frequent bacterial infections. CEBPs (or C/EBPs) are Basic leucine zipper (bZIP) transcription factors that regulate many cellular processes. There are six CEBP proteins in mammalian cells including CEBPA (alpha), CEBPB (beta), CEBPG (gamma), CEBPD (delta), and CEBPE (epsilon), which all contain highly conserved bZIP domains at their C-termini and variations at their N-terminal regions. bZIP factors act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

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                ....*....|....*....|....*....|....*....|....*....|....*.
gi 13775156  64 EKALRRKlKNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQLENQLLREKTHGL 119
Cdd:cd14715   5 EYRLRRE-RNNIAVRKSRDKAKRRVLETQQRMLEYMAENERLRSRVEQLTQELDTL 59

Cell division protein FtsB [Cell cycle control, cell division, chromosome partitioning];

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                ....*....|....*....|....*....|....*....|....*....|....*....
gi 13775156  87 RMSELEQQVVDLEEENHKLQLENQLLREKTHGL-----VVEnQELRTRLGMdtLDPDEV 140
Cdd:COG2919  30 AYRELRQEIAELEAENAKLKARNAELEAEVADLkdgpdYIE-ERAREELGM--VKPGET 85

Family of unknown function (DUF6262); This family of proteins, functionally uncharacterized, is found in bacteria. Proteins in this family are typically between 124 and 143 amino acids in length. Some members included in this family are hypothetical transposases, associated with transposon Tn554. There is a conserved sequence GV/LSR/K and a highly conserved tyrosine residue.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 13775156    68 RRKLKNRVAAQ--TARDRKKARMSELEQQVVDLEEENHKLQLENQLLREkthglvvENQEL 126
Cdd:pfam19776  57 RRELDEAIEQQggMVNPKREILDMALEKRIELLKKEIKELKRENEELKK-------ENEKL 110

Basic leucine zipper (bZIP) domain of bZIP transcription factors: a DNA-binding and dimerization domain; uncharacterized subfamily; Basic leucine zipper (bZIP) factors comprise one of the most important classes of enhancer-type transcription factors. They act in networks of homo and heterodimers in the regulation of a diverse set of cellular processes including cell survival, learning and memory, lipid metabolism, and cancer progression, among others. They also play important roles in responses to stimuli or stress signals such as cytokines, genotoxic agents, or physiological stresses. The bZIP structural motif contains a basic region and a leucine zipper, composed of alpha helices with leucine residues 7 amino acids apart, which stabilize dimerization with a parallel leucine zipper domain. Dimerization of leucine zippers creates a pair of the adjacent basic regions that bind DNA and undergo conformational change. Dimerization occurs in a specific and predictable manner resulting in hundreds of dimers having unique effects on transcription.

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                ....*....|....*....|....*....|....*....|
gi 13775156  68 RRKL-KNRVAAQTARDRKKARMSELEQQVVDLEEENHKLQ 106
Cdd:cd14811   2 QKKLaRNRESARNSRKRKKIYLELLENKVKELQQELEKLK 41