ricin B-type lectin domain, beta-trefoil fold, found in the macrophage mannose receptor (MRC) family; The MRC family includes MRC1-2, receptor-type tyrosine-protein phosphatase beta (PTPRB) isoform e, secretory phospholipase A2 receptor (PLA2R1), and lymphocyte antigen 75 (Ly-75). MRC1 mediates the endocytosis of glycoproteins by macrophages. It binds both sulfated and non-sulfated polysaccharide chains, and acts as a phagocytic receptor for bacteria, fungi, and other pathogens. It also acts as a receptor for Dengue virus envelope protein E. MRC2 may play a role as an endocytotic lectin receptor displaying calcium-dependent lectin activity. It internalizes glycosylated ligands from the extracellular space for release in an endosomal compartment via clathrin-mediated endocytosis. It may be involved in plasminogen activation system controlling the extracellular level of PLAUR/PLAU, and thus may regulate protease activity at the cell surface. It may contribute to cellular uptake, remodeling, and degradation of extracellular collagen matrices. It may play a role during cancer progression as well as in other chronic tissue destructive diseases acting on collagen turnover. It may participate in remodeling of extracellular matrix cooperating with the matrix metalloproteinases (MMPs). PTPRB (EC 3.1.3.48), also called protein-tyrosine phosphatase beta, plays an important role in blood vessel remodeling and angiogenesis. It is not necessary for the initial formation of the blood vessels but is essential for their maintenance and remodeling. It is also essential for the maintenance of endothelial cell contact integrity and for the adhesive function of VE-cadherin in endothelial cells that requires the presence of plakoglobin. PLA2R1 is a receptor for secretory phospholipase A2 (sPLA2). It acts as a receptor for phospholipase sPLA2-IB/PLA2G1B but not sPLA2-IIA/PLA2G2A. It can also bind to snake PA2-like toxins. It may be involved in responses in proinflammatory cytokine productions during endotoxic shock. It also has endocytic properties and rapidly internalizes sPLA2 ligands, which is particularly important for the clearance of extracellular sPLA2s to protect their potent enzymatic activities. Ly-75 acts as an endocytic receptor to direct captured antigens from the extracellular space to a specialized antigen-processing compartment. It causes reduced proliferation of B-lymphocytes. All family members contain a ricin B-type lectin domain at the N-terminus. The ricin B-type lectin domain shows a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain may harbor a sugar-binding pocket. One member of this family, MRC1, is missing the gamma subdomain.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2024450182  16 EAFLLQNAKIKQCLQASPTDGNLLLSDCNSASDFQDWFW-QGDSLRNHGTQSCLLV---VEANRVQTSPCDSVGFM-GWD 90
Cdd:cd23385     1 DSFLIYNEDLGKCLAARSSSSKVSLSTCNPNSPNQQWKWtSGHRLFNVGTGKCLGVsssSPSSPLRLFECDSEDELqKWK 80

                          90       100       110
                  ....*....|....*....|....*....|....*....
gi 2024450182  91 CSNLLLSPLG--SSQGYLVASKKGVALDNVRGLKAQWQS 127
Cdd:cd23385    81 CSKDGLLLLKglGLLLLYDKSGKNVVVSKGSGLSSRWKI 119

ricin B-type lectin domain, beta-trefoil fold, found in the macrophage mannose receptor (MRC) family; The MRC family includes MRC1-2, receptor-type tyrosine-protein phosphatase beta (PTPRB) isoform e, secretory phospholipase A2 receptor (PLA2R1), and lymphocyte antigen 75 (Ly-75). MRC1 mediates the endocytosis of glycoproteins by macrophages. It binds both sulfated and non-sulfated polysaccharide chains, and acts as a phagocytic receptor for bacteria, fungi, and other pathogens. It also acts as a receptor for Dengue virus envelope protein E. MRC2 may play a role as an endocytotic lectin receptor displaying calcium-dependent lectin activity. It internalizes glycosylated ligands from the extracellular space for release in an endosomal compartment via clathrin-mediated endocytosis. It may be involved in plasminogen activation system controlling the extracellular level of PLAUR/PLAU, and thus may regulate protease activity at the cell surface. It may contribute to cellular uptake, remodeling, and degradation of extracellular collagen matrices. It may play a role during cancer progression as well as in other chronic tissue destructive diseases acting on collagen turnover. It may participate in remodeling of extracellular matrix cooperating with the matrix metalloproteinases (MMPs). PTPRB (EC 3.1.3.48), also called protein-tyrosine phosphatase beta, plays an important role in blood vessel remodeling and angiogenesis. It is not necessary for the initial formation of the blood vessels but is essential for their maintenance and remodeling. It is also essential for the maintenance of endothelial cell contact integrity and for the adhesive function of VE-cadherin in endothelial cells that requires the presence of plakoglobin. PLA2R1 is a receptor for secretory phospholipase A2 (sPLA2). It acts as a receptor for phospholipase sPLA2-IB/PLA2G1B but not sPLA2-IIA/PLA2G2A. It can also bind to snake PA2-like toxins. It may be involved in responses in proinflammatory cytokine productions during endotoxic shock. It also has endocytic properties and rapidly internalizes sPLA2 ligands, which is particularly important for the clearance of extracellular sPLA2s to protect their potent enzymatic activities. Ly-75 acts as an endocytic receptor to direct captured antigens from the extracellular space to a specialized antigen-processing compartment. It causes reduced proliferation of B-lymphocytes. All family members contain a ricin B-type lectin domain at the N-terminus. The ricin B-type lectin domain shows a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain may harbor a sugar-binding pocket. One member of this family, MRC1, is missing the gamma subdomain.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2024450182  16 EAFLLQNAKIKQCLQASPTDGNLLLSDCNSASDFQDWFW-QGDSLRNHGTQSCLLV---VEANRVQTSPCDSVGFM-GWD 90
Cdd:cd23385     1 DSFLIYNEDLGKCLAARSSSSKVSLSTCNPNSPNQQWKWtSGHRLFNVGTGKCLGVsssSPSSPLRLFECDSEDELqKWK 80

                          90       100       110
                  ....*....|....*....|....*....|....*....
gi 2024450182  91 CSNLLLSPLG--SSQGYLVASKKGVALDNVRGLKAQWQS 127
Cdd:cd23385    81 CSKDGLLLLKglGLLLLYDKSGKNVVVSKGSGLSSRWKI 119

Ricin-type beta-trefoil lectin domain;

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2024450182  20 LQNAKIKQCLQA---SPTDGNLLLSDCNSASDFQDW--FWQGDsLRNHGTQSCLLVV---EANRVQTSPCDSVG 85
Cdd:pfam00652   5 IRNRASGKCLDVpggSSAGGPVGLYPCHGSNGNQLWtlTGDGT-IRSVASDLCLDVGstaDGAKVVLWPCHPGN 77

ricin B-type lectin domain, beta-trefoil fold, found in the macrophage mannose receptor (MRC) family; The MRC family includes MRC1-2, receptor-type tyrosine-protein phosphatase beta (PTPRB) isoform e, secretory phospholipase A2 receptor (PLA2R1), and lymphocyte antigen 75 (Ly-75). MRC1 mediates the endocytosis of glycoproteins by macrophages. It binds both sulfated and non-sulfated polysaccharide chains, and acts as a phagocytic receptor for bacteria, fungi, and other pathogens. It also acts as a receptor for Dengue virus envelope protein E. MRC2 may play a role as an endocytotic lectin receptor displaying calcium-dependent lectin activity. It internalizes glycosylated ligands from the extracellular space for release in an endosomal compartment via clathrin-mediated endocytosis. It may be involved in plasminogen activation system controlling the extracellular level of PLAUR/PLAU, and thus may regulate protease activity at the cell surface. It may contribute to cellular uptake, remodeling, and degradation of extracellular collagen matrices. It may play a role during cancer progression as well as in other chronic tissue destructive diseases acting on collagen turnover. It may participate in remodeling of extracellular matrix cooperating with the matrix metalloproteinases (MMPs). PTPRB (EC 3.1.3.48), also called protein-tyrosine phosphatase beta, plays an important role in blood vessel remodeling and angiogenesis. It is not necessary for the initial formation of the blood vessels but is essential for their maintenance and remodeling. It is also essential for the maintenance of endothelial cell contact integrity and for the adhesive function of VE-cadherin in endothelial cells that requires the presence of plakoglobin. PLA2R1 is a receptor for secretory phospholipase A2 (sPLA2). It acts as a receptor for phospholipase sPLA2-IB/PLA2G1B but not sPLA2-IIA/PLA2G2A. It can also bind to snake PA2-like toxins. It may be involved in responses in proinflammatory cytokine productions during endotoxic shock. It also has endocytic properties and rapidly internalizes sPLA2 ligands, which is particularly important for the clearance of extracellular sPLA2s to protect their potent enzymatic activities. Ly-75 acts as an endocytic receptor to direct captured antigens from the extracellular space to a specialized antigen-processing compartment. It causes reduced proliferation of B-lymphocytes. All family members contain a ricin B-type lectin domain at the N-terminus. The ricin B-type lectin domain shows a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain may harbor a sugar-binding pocket. One member of this family, MRC1, is missing the gamma subdomain.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2024450182  16 EAFLLQNAKIKQCLQASPTDGNLLLSDCNSASDFQDWFW-QGDSLRNHGTQSCLLV---VEANRVQTSPCDSVGFM-GWD 90
Cdd:cd23385     1 DSFLIYNEDLGKCLAARSSSSKVSLSTCNPNSPNQQWKWtSGHRLFNVGTGKCLGVsssSPSSPLRLFECDSEDELqKWK 80

                          90       100       110
                  ....*....|....*....|....*....|....*....
gi 2024450182  91 CSNLLLSPLG--SSQGYLVASKKGVALDNVRGLKAQWQS 127
Cdd:cd23385    81 CSKDGLLLLKglGLLLLYDKSGKNVVVSKGSGLSSRWKI 119

ricin B-type lectin domain, beta-trefoil fold, found in Actinomycete actinohivin and similar proteins; Actinohivin is an actinomycete lectin with a potent specific anti-human immunodeficiency virus (anti-HIV) activity. It inhibits viral entry to cells by binding the high-mannose type sugar chains of gp120. Actinohivin contains a ricin B-type lectin domain with a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain contains a sugar-binding pocket.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 2024450182  18 FLLQNAKIKQCLQASpTDGNLLLSDCNSaSDFQDWFWQGDS-----LRNHGTQSCLLVVEANRVQTSPCDSVGFMGW 89
Cdd:cd23415    45 VTLRNAATGRCLDSN-GNGGVYTLPCNG-GSYQRWRVTSTSgggvtLRNVATGRCLDSNGSGGVYTRPCNGGSYQRW 119

ricin B-type lectin domain, beta-trefoil fold, found in secretory phospholipase A2 receptor (PLA2R1) and similar proteins; PLA2R1, also called PLA2-R, PLA2R, 180 kDa secretory phospholipase A2 receptor, C-type lectin domain family 13 member C (CLEC13C), or M-type receptor, is a receptor for secretory phospholipase A2 (sPLA2). It acts as a receptor for phospholipase sPLA2-IB/PLA2G1B but not sPLA2-IIA/PLA2G2A. It can also bind to snake PA2-like toxins. It may be involved in responses in proinflammatory cytokine production during endotoxic shock. It also has endocytic properties and rapidly internalizes sPLA2 ligands, which is particularly important for the clearance of extracellular sPLA2s to protect their potent enzymatic activities. PLA2R1 contains a ricin B-type lectin domain at the N-terminus. The ricin B-type lectin domain shows a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain may harbor a sugar-binding pocket.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2024450182  18 FLLQNAKIKQCLQASptDGNLLLSDCNSASDFQDWFW-QGDSLRNHGTQSCL---LVVEANRVQTSPCDS-VGFMGWDCS 92
Cdd:cd23410     4 FILESESLKKCISAD--KSGLFLENCDQPSDSMLWKWvSRHRLFNLGSSMCLglnLSYPQQPLGLFECDStLRTLWWRCN 81

                          90       100
                  ....*....|....*....|....
gi 2024450182  93 N-LLLSP----LGSSQGYLVASKK 111
Cdd:cd23410    82 GkMLIGAdqykLTAVGSKVVASRQ 105

Ricin-type beta-trefoil; Carbohydrate-binding domain formed from presumed gene triplication.

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 2024450182   26 KQCLQASPTDGNLLLSDCNSASDFQDWFWQGD-SLRNHGTQSCLLVVE--ANRVQTSPCDS 83
Cdd:smart00458   7 GKCLDVNGNKNPVGLFDCHGTGGNQLWKLTSDgAIRIKDTDLCLTANGntGSTVTLYSCDG 67

ricin B-type lectin domain, beta-trefoil fold, found in bacterial hemolysin and similar proteins; Bacterial hemolysins are exotoxins that attack blood cell membranes and cause cytolysis by forming heptameric pores in target host membranes. After binding to target membranes, the protein assembles into a heptameric pre-pore complex. Proteolytic cleavage triggers a conformation change that is required for membrane insertion and pore formation. Hemolysin may be called "cytolysin" or "cytolytic toxin", according to a specific action for certain cells. For example, this subfamily includes Vibrio vulnificus cytolysin that attack blood cell membranes and cause cell rupture, thereby liberating hemoglobins. Members of this subfamily contain a ricin B-type lectin domain with a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain may harbor a putative sugar-binding pocket.

                          10        20        30
                  ....*....|....*....|....*....|....*.
gi 2024450182  26 KQCLQASPtDGNLLLSDCnSASDFQDWFWQGDSLRN 61
Cdd:cd23423    54 DLCLDADD-DGLLTLEQC-SLSLTQKWEWEGDRLKN 87

Ricin-type beta-trefoil lectin domain;

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2024450182  20 LQNAKIKQCLQA---SPTDGNLLLSDCNSASDFQDW--FWQGDsLRNHGTQSCLLVV---EANRVQTSPCDSVG 85
Cdd:pfam00652   5 IRNRASGKCLDVpggSSAGGPVGLYPCHGSNGNQLWtlTGDGT-IRSVASDLCLDVGstaDGAKVVLWPCHPGN 77

ricin B-type lectin domain, beta-trefoil fold, found in macrophage mannose receptor 1 (MRC1) and similar proteins; MRC1, also called MMR, C-type lectin domain family 13 member D (CLEC13D), C-type lectin domain family 13 member D-like (CLEC13DL), macrophage mannose receptor 1-like protein 1 (MRC1L1), or CD206, mediates the endocytosis of glycoproteins by macrophages. It binds both sulfated and non-sulfated polysaccharide chains. MRC1 acts as phagocytic receptor for bacteria, fungi and other pathogens. It also acts as a receptor for Dengue virus envelope protein E. MRC1 contains a ricin B-type lectin domain at the N-terminus. The ricin B-type lectin domain shows a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain may harbor a sugar-binding pocket.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2024450182  16 EAFLLQNAKIKQCLQASpTDGNLLLSDCNSASDFQDWFW-QGDSLRNHGTQSCLLVVEANR---VQTSPCDSVG-FMGWD 90
Cdd:cd23407     1 RSFLIYNEDHNRCVQAR-SSSSVTTATCNPNAESQKFRWvSGSQILSVAFKLCLGVPSKKDwvtVTLFPCNEKSeLQKWE 79

                  ...
gi 2024450182  91 CSN 93
Cdd:cd23407    80 CKN 82

Ricin-type beta-trefoil lectin domain;

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2024450182  27 QCLQASPTD--GNLLLSDCNSASDFQDWFW--QGDSLRNHGTQSCLLVVEAN----RVQTSPCDS 83
Cdd:pfam00652  55 LCLDVGSTAdgAKVVLWPCHPGNGNQRWRYdeDGTQIRNPQSGKCLDVSGAGtsngKVILWTCDS 119

ricin B-type lectin domain, beta-trefoil fold, found in Drosophila melanogaster polypeptide N-acetylgalactosaminyltransferase 3 (Pgant3) and similar proteins; Pgant3, also called pp-GaNTase 3, protein-UDP acetylgalactosaminyltransferase 3, or UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase 3, functions as a GalNAc transferase (EC 2.4.1.41) that catalyzes the initial reaction in O-linked oligosaccharide biosynthesis, the transfer of an N-acetyl-D-galactosamine residue to a serine or threonine residue on the protein receptor. Pgant3 can both act as a peptide transferase that transfers GalNAc onto unmodified peptide substrates, and as a glycopeptide transferase that requires the prior addition of a GalNAc on a peptide before adding additional GalNAc moieties. It prefers EA2 as a substrate and has weak activity toward Muc5AC-3, -13 and -3/13 substrates. Pgant3 plays a critical role in the regulation of integrin-mediated cell adhesion during wing development by influencing, via glycosylation, the secretion and localization of the integrin ligand Tig to the basal cell layer interface. It may have a role in protein O-glycosylation in the Golgi and thereby in establishing and/or maintaining a proper secretory apparatus structure. Together with Pgant35A, Pgant3 regulates integrin levels and activity-dependent integrin signaling at the synapse in neurons and muscles. Members of this subfamily contain a ricin B-type lectin domain at the C-terminus. The ricin B-type lectin domain shows a beta-trefoil fold, which is characterized by 12 beta strands folded into three similar trefoil subdomains (alpha, beta, and gamma) associated to give an overall structure with pseudo-3-fold symmetry. Each subdomain bears a potential sugar binding site.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 2024450182  28 CLQA---SPTDGNLLLSDCNSASDFQDWFWQGDS-LRNHGTqsCLLVVEANRVQTSPCDSVG 85
Cdd:cd23460    13 CLDWageSNGDKTVALKPCHGGGGNQFWMYTGDGqIRQDHL--CLTADEGNKVTLRECADQL 72