Protein: Protein disulfide-isomerase (PDI) (EC 5.3.4.1) (Prolyl 4-hydroxylase subunit beta) (Q2HWU2)
Organism: Macaca fuscata fuscata (Japanese macaque)
Function: This multifunctional protein catalyzes the formation, breakage and rearrangement of disulfide bonds. At the cell surface, seems to act as a reductase that cleaves disulfide bonds of proteins attached to the cell. May therefore cause structural modifications of exofacial proteins. Inside the cell, seems to form/rearrange disulfide bonds of nascent proteins. At high concentrations and following phosphorylation by FAM20C, functions as a chaperone that inhibits aggregation of misfolded proteins. At low concentrations, facilitates aggregation (anti-chaperone activity). May be involved with other chaperones in the structural modification of the TG precursor in hormone biogenesis. Also acts as a structural subunit of various enzymes such as prolyl 4-hydroxylase and microsomal triacylglycerol transfer protein MTTP. Receptor for LGALS9; the interaction retains P4HB at the cell surface of Th2 T helper cells, increasing disulfide reductase activity at the plasma membrane, altering the plasma membrane redox state and enhancing cell migration.
Subcellular location: Endoplasmic reticulum {ECO:0000250|UniProtKB:P07237}. Endoplasmic reticulum lumen {ECO:0000250|UniProtKB:P07237}. Melanosome {ECO:0000250|UniProtKB:P07237}. Cell membrane {ECO:0000250|UniProtKB:P09103}; Peripheral membrane protein {ECO:0000305}. Note=Highly abundant. In some cell types, seems to be also secreted or associated with the plasma membrane, where it undergoes constant shedding and replacement from intracellular sources. Localizes near CD4-enriched regions on lymphoid cell surfaces. Colocalizes with MTTP in the endoplasmic reticulum. {ECO:0000250|UniProtKB:P07237}.
Sequence: MLRRALLCLAVAAAPGLYADAPEEEDHVLVLRKSNFAEALAAHKYLLVEFYAPWCGHCKALAPEYAKAAGKLKAEGSEIRLAKVDATEESDLAQQYGVRGYPTIKFFRNGDTASPKEYTAGREADDIVNWLKKRTGPAATTLPDGAAAESLVESSEVAVIGFFKDVESDSAKQFLQAAEAIDDIPFGITSNSDVFSKYQLDKDGVVLFKKFDEGRNNFEGEVTKENLLDFIKYNQLPLVIEFTEQTAPKIFGGEIKTHILLFLPKSVSDYDGKLSNFKTAAESFKGKILFIFIDSDHTDNQRILEFFGLKKEECPAVRLITLEEEMTKYKPESDELTAERITEFCHRFLEGKIKPHLMSQELPEDWDKQPVKVLVGKNFEEVAFDENKNVFVEFYAPWCGHCKQLAPIWDKLGETYKDHENIVIAKMDSTANEVEAIKVHSFPTLKFFPASVDRTVIDYNGERTLDGFKKFLESGGQDGAGDDDDLEDLEEAEEPDMEEDDDQKAVKDEL
InterPro domains: - IPR036249: Thioredoxin-like superfamily (homologous_superfamily) [26-474]
- IPR013766: Thioredoxin domain (domain) [8-477]
- IPR005788: Protein disulfide-isomerase, thioredoxin-like domain (domain) [32-473]
- IPR005792: Protein disulphide isomerase (family) [27-510]
- IPR017937: Thioredoxin, conserved site (conserved_site) [47-409]
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0003824 (catalytic activity), GO:0016853 (isomerase activity), GO:0140096 (catalytic activity, acting on a protein), GO:0016491 (oxidoreductase activity), GO:0016667 (oxidoreductase activity, acting on a sulfur group of donors), GO:0015035 (protein-disulfide reductase activity), GO:0015036 (disulfide oxidoreductase activity)
Biological Process (BP): GO:0008150 (biological process), GO:0032502 (developmental process), GO:0032501 (multicellular organismal process), GO:0048856 (anatomical structure development), GO:0007275 (multicellular organism development), GO:0009791 (post-embryonic development), GO:0002164 (larval development), GO:0002119 (nematode larval development)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0031974 (membrane-enclosed lumen), GO:0012505 (endomembrane system), GO:0043229 (intracellular organelle), GO:0043233 (organelle lumen), GO:0005783 (endoplasmic reticulum), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle), GO:0070013 (intracellular organelle lumen), GO:0005788 (endoplasmic reticulum lumen)