interphotoreceptor retinoid binding protein, partial [Chiromyscus thomasi]
Protein Classification
interphotoreceptor retinoid-binding protein( domain architecture ID 10166016)
interphotoreceptor retinoid-binding protein (IRBP) is a large glycoprotein known to bind retinoids and found primarily in the interphotoreceptor matrix of the retina between the retinal pigment epithelium and the photoreceptor cells
List of domain hits
| Name | Accession | Description | Interval | E-value | ||||
| Peptidase_S41_IRBP | cd07563 | Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor ... |
54-242 | 1.77e-63 | ||||
Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor retinoid-binding protein (IRBP) is a homolog of the S41 protease, C-terminal processing peptidase (CTPase) family. It is thought to facilitate the compartmentalization of the visual cycle that requires poorly soluble and potentially toxic retinoids to cross the aqueous subretinal space between the photoreceptors and the retinal pigment epithelium (RPE). IRBP is secreted by photoreceptors into the interphotoreceptor matrix (IPM) where it is rapidly turned over by a combination of RPE and photoreceptor endocytosis. It is the most abundant soluble protein component of the IPM, consisting of homologous modules, each repeat structure arising through the duplication (as in teleost IRBP) or quadruplication (in tetrapods) of an ancient gene, arisen in the early evolution of the vertebrate eye. IRBP has been shown to promote the release of all-trans retinol from photoreceptors and facilitates its delivery to the RPE. Conversely, IRBP can promote the release of 11-cis-retinal from the RPE, prevent its isomerization in the subretinal space, and transfer it to photoreceptors. In vivo evidence implicates IRBP as a retinoid transporter in the visual cycle, suggesting a critical role for IRBP in cone function essential for human vision. IRBP is a dominant autoimmune antigen in the eye; IRBP proteolysis analysis has proven a useful biomarker for autoimmune uveitis (AU) disorders, a major cause of blindness. This family also includes a chlamydia-secreted protein, designated chlamydia protease-like activity factor (CPAF), known to degrade host proteins, enabling Chlamydia to evade host defenses and replicate. : Pssm-ID: 143479 [Multi-domain] Cd Length: 250 Bit Score: 203.29 E-value: 1.77e-63
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| Peptidase_S41_N | pfam11918 | N-terminal domain of Peptidase_S41 in eukaryotic IRBP; Peptidase_S41_N is a family found at ... |
233-358 | 4.95e-57 | ||||
N-terminal domain of Peptidase_S41 in eukaryotic IRBP; Peptidase_S41_N is a family found at the N-terminus of the functional unit of interphotoreceptor retinoid binding proteins 3, IRBP, in eukaryotes. From the structure of PDB:1j7x, the domain forms the N-terminal end of the module which is characterized as a serine-peptidase, pfam03572. Peptidase_S41_N forms a three-helix bundle followed by a small beta strand and is termed domain A. Part of the peptidase domain folds back over domain A to create a largely hydrophobic cleft between the two domains. On binding of ligand domain A is structurally rearranged with respect to domain B. : Pssm-ID: 463396 Cd Length: 129 Bit Score: 182.52 E-value: 4.95e-57
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| Name | Accession | Description | Interval | E-value | ||||
| Peptidase_S41_IRBP | cd07563 | Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor ... |
54-242 | 1.77e-63 | ||||
Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor retinoid-binding protein (IRBP) is a homolog of the S41 protease, C-terminal processing peptidase (CTPase) family. It is thought to facilitate the compartmentalization of the visual cycle that requires poorly soluble and potentially toxic retinoids to cross the aqueous subretinal space between the photoreceptors and the retinal pigment epithelium (RPE). IRBP is secreted by photoreceptors into the interphotoreceptor matrix (IPM) where it is rapidly turned over by a combination of RPE and photoreceptor endocytosis. It is the most abundant soluble protein component of the IPM, consisting of homologous modules, each repeat structure arising through the duplication (as in teleost IRBP) or quadruplication (in tetrapods) of an ancient gene, arisen in the early evolution of the vertebrate eye. IRBP has been shown to promote the release of all-trans retinol from photoreceptors and facilitates its delivery to the RPE. Conversely, IRBP can promote the release of 11-cis-retinal from the RPE, prevent its isomerization in the subretinal space, and transfer it to photoreceptors. In vivo evidence implicates IRBP as a retinoid transporter in the visual cycle, suggesting a critical role for IRBP in cone function essential for human vision. IRBP is a dominant autoimmune antigen in the eye; IRBP proteolysis analysis has proven a useful biomarker for autoimmune uveitis (AU) disorders, a major cause of blindness. This family also includes a chlamydia-secreted protein, designated chlamydia protease-like activity factor (CPAF), known to degrade host proteins, enabling Chlamydia to evade host defenses and replicate. Pssm-ID: 143479 [Multi-domain] Cd Length: 250 Bit Score: 203.29 E-value: 1.77e-63
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| Peptidase_S41_N | pfam11918 | N-terminal domain of Peptidase_S41 in eukaryotic IRBP; Peptidase_S41_N is a family found at ... |
233-358 | 4.95e-57 | ||||
N-terminal domain of Peptidase_S41 in eukaryotic IRBP; Peptidase_S41_N is a family found at the N-terminus of the functional unit of interphotoreceptor retinoid binding proteins 3, IRBP, in eukaryotes. From the structure of PDB:1j7x, the domain forms the N-terminal end of the module which is characterized as a serine-peptidase, pfam03572. Peptidase_S41_N forms a three-helix bundle followed by a small beta strand and is termed domain A. Part of the peptidase domain folds back over domain A to create a largely hydrophobic cleft between the two domains. On binding of ligand domain A is structurally rearranged with respect to domain B. Pssm-ID: 463396 Cd Length: 129 Bit Score: 182.52 E-value: 4.95e-57
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| TSPc | smart00245 | tail specific protease; tail specific protease |
33-232 | 4.88e-55 | ||||
tail specific protease; tail specific protease Pssm-ID: 214582 Cd Length: 192 Bit Score: 179.37 E-value: 4.88e-55
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| CtpA | COG0793 | C-terminal processing protease CtpA/Prc, contains a PDZ domain [Posttranslational modification, ... |
31-227 | 5.10e-18 | ||||
C-terminal processing protease CtpA/Prc, contains a PDZ domain [Posttranslational modification, protein turnover, chaperones]; Pssm-ID: 440556 [Multi-domain] Cd Length: 341 Bit Score: 84.15 E-value: 5.10e-18
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| Peptidase_S41 | pfam03572 | Peptidase family S41; |
53-227 | 4.49e-14 | ||||
Peptidase family S41; Pssm-ID: 460977 Cd Length: 165 Bit Score: 69.56 E-value: 4.49e-14
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| Peptidase_S41_IRBP | cd07563 | Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor ... |
253-315 | 1.37e-04 | ||||
Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor retinoid-binding protein (IRBP) is a homolog of the S41 protease, C-terminal processing peptidase (CTPase) family. It is thought to facilitate the compartmentalization of the visual cycle that requires poorly soluble and potentially toxic retinoids to cross the aqueous subretinal space between the photoreceptors and the retinal pigment epithelium (RPE). IRBP is secreted by photoreceptors into the interphotoreceptor matrix (IPM) where it is rapidly turned over by a combination of RPE and photoreceptor endocytosis. It is the most abundant soluble protein component of the IPM, consisting of homologous modules, each repeat structure arising through the duplication (as in teleost IRBP) or quadruplication (in tetrapods) of an ancient gene, arisen in the early evolution of the vertebrate eye. IRBP has been shown to promote the release of all-trans retinol from photoreceptors and facilitates its delivery to the RPE. Conversely, IRBP can promote the release of 11-cis-retinal from the RPE, prevent its isomerization in the subretinal space, and transfer it to photoreceptors. In vivo evidence implicates IRBP as a retinoid transporter in the visual cycle, suggesting a critical role for IRBP in cone function essential for human vision. IRBP is a dominant autoimmune antigen in the eye; IRBP proteolysis analysis has proven a useful biomarker for autoimmune uveitis (AU) disorders, a major cause of blindness. This family also includes a chlamydia-secreted protein, designated chlamydia protease-like activity factor (CPAF), known to degrade host proteins, enabling Chlamydia to evade host defenses and replicate. Pssm-ID: 143479 [Multi-domain] Cd Length: 250 Bit Score: 43.05 E-value: 1.37e-04
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| Name | Accession | Description | Interval | E-value | ||||
| Peptidase_S41_IRBP | cd07563 | Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor ... |
54-242 | 1.77e-63 | ||||
Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor retinoid-binding protein (IRBP) is a homolog of the S41 protease, C-terminal processing peptidase (CTPase) family. It is thought to facilitate the compartmentalization of the visual cycle that requires poorly soluble and potentially toxic retinoids to cross the aqueous subretinal space between the photoreceptors and the retinal pigment epithelium (RPE). IRBP is secreted by photoreceptors into the interphotoreceptor matrix (IPM) where it is rapidly turned over by a combination of RPE and photoreceptor endocytosis. It is the most abundant soluble protein component of the IPM, consisting of homologous modules, each repeat structure arising through the duplication (as in teleost IRBP) or quadruplication (in tetrapods) of an ancient gene, arisen in the early evolution of the vertebrate eye. IRBP has been shown to promote the release of all-trans retinol from photoreceptors and facilitates its delivery to the RPE. Conversely, IRBP can promote the release of 11-cis-retinal from the RPE, prevent its isomerization in the subretinal space, and transfer it to photoreceptors. In vivo evidence implicates IRBP as a retinoid transporter in the visual cycle, suggesting a critical role for IRBP in cone function essential for human vision. IRBP is a dominant autoimmune antigen in the eye; IRBP proteolysis analysis has proven a useful biomarker for autoimmune uveitis (AU) disorders, a major cause of blindness. This family also includes a chlamydia-secreted protein, designated chlamydia protease-like activity factor (CPAF), known to degrade host proteins, enabling Chlamydia to evade host defenses and replicate. Pssm-ID: 143479 [Multi-domain] Cd Length: 250 Bit Score: 203.29 E-value: 1.77e-63
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| Peptidase_S41_N | pfam11918 | N-terminal domain of Peptidase_S41 in eukaryotic IRBP; Peptidase_S41_N is a family found at ... |
233-358 | 4.95e-57 | ||||
N-terminal domain of Peptidase_S41 in eukaryotic IRBP; Peptidase_S41_N is a family found at the N-terminus of the functional unit of interphotoreceptor retinoid binding proteins 3, IRBP, in eukaryotes. From the structure of PDB:1j7x, the domain forms the N-terminal end of the module which is characterized as a serine-peptidase, pfam03572. Peptidase_S41_N forms a three-helix bundle followed by a small beta strand and is termed domain A. Part of the peptidase domain folds back over domain A to create a largely hydrophobic cleft between the two domains. On binding of ligand domain A is structurally rearranged with respect to domain B. Pssm-ID: 463396 Cd Length: 129 Bit Score: 182.52 E-value: 4.95e-57
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| TSPc | smart00245 | tail specific protease; tail specific protease |
33-232 | 4.88e-55 | ||||
tail specific protease; tail specific protease Pssm-ID: 214582 Cd Length: 192 Bit Score: 179.37 E-value: 4.88e-55
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| Peptidase_S41 | cd06567 | C-terminal processing peptidase family S41; Peptidase family S41 (C-terminal processing ... |
53-232 | 1.39e-30 | ||||
C-terminal processing peptidase family S41; Peptidase family S41 (C-terminal processing peptidase or CTPase family) contains very different subfamilies; it includes photosystem II D1 C-terminal processing protease (CTPase), interphotoreceptor retinoid-binding protein IRBP and tricorn protease (TRI). CTPase and TRI both contain the PDZ domain while IRBP, although being very similar to the tail-specific protease domain, lacks the PDZ insertion domain and hydrolytic activity. These serine proteases have distinctly different active sites: in CTPase, the active site consists of a serine/lysine catalytic dyad while in tricorn core protease, it is a tetrad (serine, histidine, serine, glutamate). CPases with different substrate specificities in different species include processing of D1 protein of the photosystem II reaction center in higher plants and cleavage of a peptide of 11 residues from the precursor form of penicillin-binding protein; and others such as tricorn protease (TRI) act as a carboxypeptidase, involved in the degradation of proteasomal products. CTPase homolog IRBP, secreted by photoreceptors into the interphotoreceptor matrix, having arisen in the early evolution of the vertebrate eye, promotes the release of all-trans retinol from photoreceptors and facilitates its delivery to the retinal pigment epithelium. Pssm-ID: 143475 [Multi-domain] Cd Length: 224 Bit Score: 116.63 E-value: 1.39e-30
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| CtpA | COG0793 | C-terminal processing protease CtpA/Prc, contains a PDZ domain [Posttranslational modification, ... |
31-227 | 5.10e-18 | ||||
C-terminal processing protease CtpA/Prc, contains a PDZ domain [Posttranslational modification, protein turnover, chaperones]; Pssm-ID: 440556 [Multi-domain] Cd Length: 341 Bit Score: 84.15 E-value: 5.10e-18
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| Peptidase_S41 | pfam03572 | Peptidase family S41; |
53-227 | 4.49e-14 | ||||
Peptidase family S41; Pssm-ID: 460977 Cd Length: 165 Bit Score: 69.56 E-value: 4.49e-14
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| Peptidase_S41_TRI | cd07562 | Tricorn protease; serine protease family S41; The tricorn protease (TRI), a member of the S41 ... |
41-244 | 9.63e-14 | ||||
Tricorn protease; serine protease family S41; The tricorn protease (TRI), a member of the S41 peptidase family and named for its tricorn-like shape, exists only in some archaea and eubacteria. It has been shown to act as a carboxypeptidase, involved in the degradation of proteasomal products to preferentially yield di- and tripeptides, with subsequent and final degradations to free amino acid residues by tricorn interacting factors, F1, F2 and F3. Tricorn is a hexameric D3-symmetric protease of 720kD, and can self-associate further into a giant icosahedral capsid structure containing twenty copies of the complex. Each tricorn peptidase monomer consists of five structural domains: a six-bladed beta-propeller and a seven-bladed beta-propeller that limit access to the active site, the two domains (C1 and C2) that carry the active site residues, and a PDZ-like domain (proposed to be important for substrate recognition) between the C1 and C2 domains. The active site tetrad residues are distributed between the C1 and C2 domains, with serine and histidine on C1 and serine and glutamate on C2. Pssm-ID: 143478 [Multi-domain] Cd Length: 266 Bit Score: 70.69 E-value: 9.63e-14
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| Peptidase_S41_IRBP | cd07563 | Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor ... |
253-315 | 1.37e-04 | ||||
Interphotoreceptor retinoid-binding protein; serine protease family S41; Interphotoreceptor retinoid-binding protein (IRBP) is a homolog of the S41 protease, C-terminal processing peptidase (CTPase) family. It is thought to facilitate the compartmentalization of the visual cycle that requires poorly soluble and potentially toxic retinoids to cross the aqueous subretinal space between the photoreceptors and the retinal pigment epithelium (RPE). IRBP is secreted by photoreceptors into the interphotoreceptor matrix (IPM) where it is rapidly turned over by a combination of RPE and photoreceptor endocytosis. It is the most abundant soluble protein component of the IPM, consisting of homologous modules, each repeat structure arising through the duplication (as in teleost IRBP) or quadruplication (in tetrapods) of an ancient gene, arisen in the early evolution of the vertebrate eye. IRBP has been shown to promote the release of all-trans retinol from photoreceptors and facilitates its delivery to the RPE. Conversely, IRBP can promote the release of 11-cis-retinal from the RPE, prevent its isomerization in the subretinal space, and transfer it to photoreceptors. In vivo evidence implicates IRBP as a retinoid transporter in the visual cycle, suggesting a critical role for IRBP in cone function essential for human vision. IRBP is a dominant autoimmune antigen in the eye; IRBP proteolysis analysis has proven a useful biomarker for autoimmune uveitis (AU) disorders, a major cause of blindness. This family also includes a chlamydia-secreted protein, designated chlamydia protease-like activity factor (CPAF), known to degrade host proteins, enabling Chlamydia to evade host defenses and replicate. Pssm-ID: 143479 [Multi-domain] Cd Length: 250 Bit Score: 43.05 E-value: 1.37e-04
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| Peptidase_S41_CPP | cd07560 | C-terminal processing peptidase; serine protease family S41; The C-terminal processing ... |
54-183 | 1.01e-03 | ||||
C-terminal processing peptidase; serine protease family S41; The C-terminal processing peptidase (CPP, EC 3.4.21.102) also known as tail-specific protease (tsp), the photosystem II D1 C-terminal processing protease (D1P), and other related S41 protease family members are present in this CD. CPP is synthesized as a precursor form with a carboxyl-terminal extension. It specifically recognizes a C-terminal tripeptide, Xaa-Yaa-Zaa, in which Xaa is preferably Ala or Leu, Yaa is preferably Ala or Tyr and Zaa is preferably Ala, but then cleaves at a variable distance from the C-terminus. The C-terminal carboxylate group is essential, and proteins where this group is amidated are not substrates. This family of proteases contains the PDZ domain that promotes protein-protein interactions and is important for substrate recognition. The active site consists of a serine/lysine catalytic dyad. The bacterial CCP-1 is believed to be important for the degradation of incorrectly synthesized proteins as well as protection from thermal and osmotic stresses. In E. coli, it is involved in the cleavage of a C-terminal peptide of 11 residues from the precursor form of penicillin-binding protein 3 (PBP3). In the plant chloroplast, the enzyme removes the C-terminal extension of the D1 polypeptide of photosystem II, allowing the light-driven assembly of the tetranuclear manganese cluster, which is responsible for photosynthetic water oxidation. Pssm-ID: 143476 [Multi-domain] Cd Length: 211 Bit Score: 40.09 E-value: 1.01e-03
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| Peptidase_S41_CPP_like | cd07561 | C-terminal processing peptidase-like; serine protease family S41; Bacterial protease homologs ... |
53-185 | 2.35e-03 | ||||
C-terminal processing peptidase-like; serine protease family S41; Bacterial protease homologs of the S41 family related to C-terminal processing peptidase (CPP). CPP-1 is believed to be important for the degradation of incorrectly synthesized proteins as well as protection from thermal and osmotic stresses. CPP is synthesized with an extension on its carboxyl-terminus and specifically recognizes a C-terminal tripeptide, but cleaves at variable distance from the C-terminus. The CPP active site consists of a serine/lysine catalytic dyad. Conservation of these residues is seen in the CPP-like proteins of this group. CPP proteins contain a PDZ domain that promotes protein-protein interactions and is important for substrate recognition however, most of CPP-like proteins only have an internal fragment or lack the PDZ domain. Pssm-ID: 143477 [Multi-domain] Cd Length: 256 Bit Score: 39.16 E-value: 2.35e-03
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