excinuclease ABC, C subunit; This family consists of the DNA repair enzyme UvrC, an ABC ...
11-573
0e+00
excinuclease ABC, C subunit; This family consists of the DNA repair enzyme UvrC, an ABC excinuclease subunit which interacts with the UvrA/UvrB complex to excise UV-damaged nucleotide segments. [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 272953 [Multi-domain] Cd Length: 574 Bit Score: 633.25 E-value: 0e+00
UvrC RNAse H endonuclease domain; This domain is found in the C subunits of the bacterial and ...
379-525
1.27e-74
UvrC RNAse H endonuclease domain; This domain is found in the C subunits of the bacterial and archaeal UvrABC system which catalyzes nucleotide excision repair in a multi-step process. UvrC catalyzes the first incision on the fourth or fifth phosphodiester bond 3' and on the eighth phosphodiester bond 5' from the damage that is to be excised. The domain described here represents the RNAse H endonuclease domain, located at the C-terminal, between the UvrBC and the (HhH)2 domains, nearby the N-terminal of the HhH. Despite the lack of sequence homology, the endonuclease domain has an RNase H-like fold, which is characteriztic of enzymes with nuclease or polynucleotide transferase activities. RNase H-related enzymes typically contain a highly conserved carboxylate triad, usually DDE, in their catalytic centre. However, instead of a third carboxylate, UvrC of Thermotoga maritima was found to contain a highly conserved histidine (H488) on helix-4 in close proximity to two aspartates.
Pssm-ID: 462484 [Multi-domain] Cd Length: 150 Bit Score: 234.65 E-value: 1.27e-74
Catalytic GIY-YIG domain of nucleotide excision repair endonucleases UvrC, Cho, and similar ...
15-94
4.07e-38
Catalytic GIY-YIG domain of nucleotide excision repair endonucleases UvrC, Cho, and similar proteins; UvrC is essential for nucleotide excision repair (NER). The N-terminal catalytic GIY-YIG domain of UvrC (also known as Uri domain) is responsible for the 3' incision reaction and the C-terminal half of UvrC, consisting of an UvrB-binding domain (UvrBb), EndoV-like nuclease domain and a helix-hairpin-helix (HhH) DNA-binding domain, contains the residues involved in 5' incision. The N- and C-terminal regions are joined by a common Cys-rich domain containing four conserved Cys residues. Besides UvrC, protein Cho (UvrC homolog) serves as a second endonuclease in E. coli NER. Cho contains GIY-YIG motif followed by a Cys-rich region and shares sequence homology with the N-terminal half of UvrC. It is capable of incising the DNA at the 3' side of a lesion in the presence of the UvrA and UvrB proteins during NER. The C-terminal half of Cho is a unique uncharacterized domain, which is distinct from that of UvrC. Moreover, unlike UvrC, Cho does not require the UvrC-binding domain of UvrB for the 3' incision reaction, which might cause the shift in incision position and the difference in incision efficiencies between Cho and UvrC on different damaged substrates. Due to this, the range of NER in E. coli can be broadened by combining action of Cho and UvrC. This family also includes many uncharacterized epsilon proofreading subunits of DNA polymerase III, which have an additional N-terminal ExoIII domain and a 3'-5' exonuclease domain homolog, fused to an UvrC-like region or a Cho-like region. The UvrC-like region includes a GIY-YIG motif, followed by a Cys-rich region, and an UvrB-binding domain (UvrBb), but lacks the EndoV-like nuclease domain and the helix-hairpin-helix (HhH) DNA-binding domain. The Cho-like region consists of a GIY-YIG motif, followed by the Cys-rich region, and the unique uncharacterized domain presenting in the C-terminal half of Cho. Some family members may not carry the Cys-rich region. This family also includes a specific Cho-like protein from G. violaceus, which possesses only UvrBb domain at the C-terminus, but lacks the additional N-terminal ExoIII domain. The oother two remote homologs of UvrC, Bacillus-I and -II, are included in this family as well. Both of them contain a GIY-YIG domain, but no Cys-rich region. Moreover, the whole C-terminal region of Bacillus-I is replaces by an unknown domain, and Bacillus-II possesses another unknown N-terminal extension.
Pssm-ID: 198381 [Multi-domain] Cd Length: 81 Bit Score: 135.30 E-value: 4.07e-38
excinuclease ABC, C subunit; This family consists of the DNA repair enzyme UvrC, an ABC ...
11-573
0e+00
excinuclease ABC, C subunit; This family consists of the DNA repair enzyme UvrC, an ABC excinuclease subunit which interacts with the UvrA/UvrB complex to excise UV-damaged nucleotide segments. [DNA metabolism, DNA replication, recombination, and repair]
Pssm-ID: 272953 [Multi-domain] Cd Length: 574 Bit Score: 633.25 E-value: 0e+00
UvrC RNAse H endonuclease domain; This domain is found in the C subunits of the bacterial and ...
379-525
1.27e-74
UvrC RNAse H endonuclease domain; This domain is found in the C subunits of the bacterial and archaeal UvrABC system which catalyzes nucleotide excision repair in a multi-step process. UvrC catalyzes the first incision on the fourth or fifth phosphodiester bond 3' and on the eighth phosphodiester bond 5' from the damage that is to be excised. The domain described here represents the RNAse H endonuclease domain, located at the C-terminal, between the UvrBC and the (HhH)2 domains, nearby the N-terminal of the HhH. Despite the lack of sequence homology, the endonuclease domain has an RNase H-like fold, which is characteriztic of enzymes with nuclease or polynucleotide transferase activities. RNase H-related enzymes typically contain a highly conserved carboxylate triad, usually DDE, in their catalytic centre. However, instead of a third carboxylate, UvrC of Thermotoga maritima was found to contain a highly conserved histidine (H488) on helix-4 in close proximity to two aspartates.
Pssm-ID: 462484 [Multi-domain] Cd Length: 150 Bit Score: 234.65 E-value: 1.27e-74
Catalytic GIY-YIG domain of nucleotide excision repair endonucleases UvrC, Cho, and similar ...
15-94
4.07e-38
Catalytic GIY-YIG domain of nucleotide excision repair endonucleases UvrC, Cho, and similar proteins; UvrC is essential for nucleotide excision repair (NER). The N-terminal catalytic GIY-YIG domain of UvrC (also known as Uri domain) is responsible for the 3' incision reaction and the C-terminal half of UvrC, consisting of an UvrB-binding domain (UvrBb), EndoV-like nuclease domain and a helix-hairpin-helix (HhH) DNA-binding domain, contains the residues involved in 5' incision. The N- and C-terminal regions are joined by a common Cys-rich domain containing four conserved Cys residues. Besides UvrC, protein Cho (UvrC homolog) serves as a second endonuclease in E. coli NER. Cho contains GIY-YIG motif followed by a Cys-rich region and shares sequence homology with the N-terminal half of UvrC. It is capable of incising the DNA at the 3' side of a lesion in the presence of the UvrA and UvrB proteins during NER. The C-terminal half of Cho is a unique uncharacterized domain, which is distinct from that of UvrC. Moreover, unlike UvrC, Cho does not require the UvrC-binding domain of UvrB for the 3' incision reaction, which might cause the shift in incision position and the difference in incision efficiencies between Cho and UvrC on different damaged substrates. Due to this, the range of NER in E. coli can be broadened by combining action of Cho and UvrC. This family also includes many uncharacterized epsilon proofreading subunits of DNA polymerase III, which have an additional N-terminal ExoIII domain and a 3'-5' exonuclease domain homolog, fused to an UvrC-like region or a Cho-like region. The UvrC-like region includes a GIY-YIG motif, followed by a Cys-rich region, and an UvrB-binding domain (UvrBb), but lacks the EndoV-like nuclease domain and the helix-hairpin-helix (HhH) DNA-binding domain. The Cho-like region consists of a GIY-YIG motif, followed by the Cys-rich region, and the unique uncharacterized domain presenting in the C-terminal half of Cho. Some family members may not carry the Cys-rich region. This family also includes a specific Cho-like protein from G. violaceus, which possesses only UvrBb domain at the C-terminus, but lacks the additional N-terminal ExoIII domain. The oother two remote homologs of UvrC, Bacillus-I and -II, are included in this family as well. Both of them contain a GIY-YIG domain, but no Cys-rich region. Moreover, the whole C-terminal region of Bacillus-I is replaces by an unknown domain, and Bacillus-II possesses another unknown N-terminal extension.
Pssm-ID: 198381 [Multi-domain] Cd Length: 81 Bit Score: 135.30 E-value: 4.07e-38
GIY-YIG catalytic domain; This domain called GIY-YIG is found in the amino terminal region of ...
19-93
3.28e-09
GIY-YIG catalytic domain; This domain called GIY-YIG is found in the amino terminal region of excinuclease abc subunit c (uvrC), bacteriophage T4 endonucleases segA, segB, segC, segD and segE; it is also found in putative endonucleases encoded by group I introns of fungi and phage. The structure of I-TevI a GIY-YIG endonuclease, reveals a novel alpha/beta-fold with a central three-stranded antiparallel beta-sheet flanked by three helices. The most conserved and putative catalytic residues are located on a shallow, concave surface and include a metal coordination site.
Pssm-ID: 426314 [Multi-domain] Cd Length: 78 Bit Score: 53.50 E-value: 3.28e-09
GIY-YIG nuclease domain superfamily; The GIY-YIG nuclease domain superfamily includes a large ...
22-88
4.02e-08
GIY-YIG nuclease domain superfamily; The GIY-YIG nuclease domain superfamily includes a large and diverse group of proteins involved in many cellular processes, such as class I homing GIY-YIG family endonucleases, prokaryotic nucleotide excision repair proteins UvrC and Cho, type II restriction enzymes, the endonuclease/reverse transcriptase of eukaryotic retrotransposable elements, and a family of eukaryotic enzymes that repair stalled replication forks. All of these members contain a conserved GIY-YIG nuclease domain that may serve as a scaffold for the coordination of a divalent metal ion required for catalysis of the phosphodiester bond cleavage. By combining with different specificity, targeting, or other domains, the GIY-YIG nucleases may perform different functions.
Pssm-ID: 198380 [Multi-domain] Cd Length: 69 Bit Score: 50.44 E-value: 4.02e-08
Catalytic GIY-YIG domain of putative intron-encoded endonuclease bI1 and similar proteins; The ...
19-96
4.72e-06
Catalytic GIY-YIG domain of putative intron-encoded endonuclease bI1 and similar proteins; The prototype of this family is a putative intron-encoded mitochondrial DNA endonuclease bI1 found in mitochondrion Ustilago maydis. This protein may arise from proteolytic cleavage of an in-frame translation of COB exon 1 plus intron 1, containing the bI1 open reading frame. It contains an N-terminal truncated non-functional cytochrome b region and a C-terminal intron-encoded endonuclease bI1 region. The bI1 region shows high sequence similarity to endonucleases of group I introns of fungi and phage and might be involved in intron homing. Many uncharacterized bI1 homologs existing in fungi and chlorophyta in this family do not contain the cytochrome b region, but have a standalone bI1-like region, which contains a GIY-YIG domain and a minor-groove binding alpha-helix nuclease-associated modular domain (NUMOD). This family also includes a Yarrowia lipolytica mobile group-II intron COX1-i1, also called intron alpha, encoding protein with reverse transcriptase activity. The group-II intron COX1-i1 may be involv ed both in the generation of the circular multimeric DNA molecules (senDNA alpha) which amplify during the senescence syndrome and in the generation of the site-specific deletion which accumulates in the premature-death syndrome.
Pssm-ID: 198392 [Multi-domain] Cd Length: 88 Bit Score: 44.91 E-value: 4.72e-06
Catalytic GIY-YIG domain of coliphage T4 non-specific endonuclease II, type II restriction ...
28-94
3.89e-04
Catalytic GIY-YIG domain of coliphage T4 non-specific endonuclease II, type II restriction endonuclease R.Hpy188I, and similar proteins; This family includes two different GIY-YIG enzymes, coliphage T4 non-specific endonuclease II (EndoII), and type II restriction endonuclease R.Hpy188I. They display high sequence similarity to each other, and both of them contain an extra N-terminal hairpin that lacks counterparts in other GIY-YIG enzymes. EndoII encoded by gene denA catalyzes the initial step in degradation of host DNA, which permits scavenging of host-derived nucleotides for phage DNA synthesis. R.Hpy188I recognizes the unique sequence, 5'-TCNGA-3', and cleaves the DNA between nucleotides N and G in its recognition sequence to generate a single nucleotide 3'-overhang. EndoII binds to two DNA substrates as an X-shaped tetrameric structure composed as a dimer of dimers. In contrast, two subunits of R.Hpy188I form a dimer to embrace one bound DNA. Divalent metal-ion cofactors are required for their catalytic events, but not for the substrates binding.
Pssm-ID: 198383 [Multi-domain] Cd Length: 97 Bit Score: 40.02 E-value: 3.89e-04
H3TH domain of the 5'-3' exonuclease of Taq DNA polymerase I and homologs; H3TH ...
545-591
4.71e-03
H3TH domain of the 5'-3' exonuclease of Taq DNA polymerase I and homologs; H3TH (helix-3-turn-helix) domains of the 5'-3' exonuclease (53EXO) of mutli-domain DNA polymerase I and single domain protein homologs are included in this family. Taq DNA polymerase I contains a polymerase domain for synthesizing a new DNA strand and a 53EXO domain for cleaving RNA primers or damaged DNA strands. Taq's 53EXO recognizes and endonucleolytically cleaves a structure-specific DNA substrate that has a bifurcated downstream duplex and an upstream template-primer duplex that overlaps the downstream duplex by 1 bp. The 53EXO cleaves the unpaired 5'-arm of the overlap flap DNA substrate. 5'-3' exonucleases are members of the structure-specific, 5' nuclease family that catalyzes hydrolysis of DNA duplex-containing nucleic acid structures during DNA replication, repair, and recombination. These nucleases contain a PIN (PilT N terminus) domain with a helical arch/clamp region/I domain (not included here) and inserted within the PIN domain is an atypical helix-hairpin-helix-2 (HhH2)-like region. This atypical HhH2 region, the H3TH domain, has an extended loop with at least three turns between the first two helices, and only three of the four helices appear to be conserved. Both the H3TH domain and the helical arch/clamp region are involved in DNA binding. Studies suggest that a glycine-rich loop in the H3TH domain contacts the phosphate backbone of the template strand in the downstream DNA duplex. The nucleases within this family have a carboxylate rich active site that is involved in binding essential divalent metal ion cofactors (i. e., Mg2+ or Mn2+ or Zn2+) required for nuclease activity. The first metal binding site is composed entirely of Asp/Glu residues from the PIN domain, whereas, the second metal binding site is composed generally of two Asp residues from the PIN domain and two Asp residues from the H3TH domain. Together with the helical arch and network of amino acids interacting with metal binding ions, the H3TH region defines a positively charged active-site DNA-binding groove in structure-specific 5' nucleases.
Pssm-ID: 188618 [Multi-domain] Cd Length: 73 Bit Score: 36.22 E-value: 4.71e-03
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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