NameProtein disulfide-isomerase
Synonyms
  • 5.3.4.1
  • Cellular thyroid hormone-binding protein
  • ERBA2L
  • p55
  • PDI
  • PDIA1
  • PO4DB
  • Prolyl 4-hydroxylase subunit beta
Gene NameP4HB
OrganismHuman
Amino acid sequence
>lcl|BSEQ0019291|Protein disulfide-isomerase
MLRRALLCLAVAALVRADAPEEEDHVLVLRKSNFAEALAAHKYLLVEFYAPWCGHCKALA
PEYAKAAGKLKAEGSEIRLAKVDATEESDLAQQYGVRGYPTIKFFRNGDTASPKEYTAGR
EADDIVNWLKKRTGPAATTLPDGAAAESLVESSEVAVIGFFKDVESDSAKQFLQAAEAID
DIPFGITSNSDVFSKYQLDKDGVVLFKKFDEGRNNFEGEVTKENLLDFIKHNQLPLVIEF
TEQTAPKIFGGEIKTHILLFLPKSVSDYDGKLSNFKTAAESFKGKILFIFIDSDHTDNQR
ILEFFGLKKEECPAVRLITLEEEMTKYKPESEELTAERITEFCHRFLEGKIKPHLMSQEL
PEDWDKQPVKVLVGKNFEDVAFDEKKNVFVEFYAPWCGHCKQLAPIWDKLGETYKDHENI
VIAKMDSTANEVEAVKVHSFPTLKFFPASADRTVIDYNGERTLDGFKKFLESGGQDGAGD
DDDLEDLEEAEEPDMEEDDDQKAVKDEL
Number of residues508
Molecular Weight57115.795
Theoretical pI4.49
GO Classification
Functions
  • integrin binding
  • protein disulfide isomerase activity
  • procollagen-proline 4-dioxygenase activity
  • protein heterodimerization activity
  • endopeptidase activity
  • poly(A) RNA binding
Processes
  • protein folding
  • response to reactive oxygen species
  • cell redox homeostasis
  • small molecule metabolic process
  • peptidyl-proline hydroxylation to 4-hydroxy-L-proline
  • positive regulation of viral entry into host cell
  • extracellular matrix organization
  • regulation of oxidative stress-induced intrinsic apoptotic signaling pathway
  • lipoprotein metabolic process
  • cellular response to hypoxia
  • proteolysis
  • response to endoplasmic reticulum stress
Components
  • endoplasmic reticulum
  • endoplasmic reticulum-Golgi intermediate compartment
  • endoplasmic reticulum chaperone complex
  • extracellular exosome
  • external side of plasma membrane
  • endoplasmic reticulum lumen
  • procollagen-proline 4-dioxygenase complex
  • focal adhesion
  • melanosome
  • extracellular region
General FunctionProtein heterodimerization activity
Specific FunctionThis 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, 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 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 (PubMed:21670307).
Pfam Domain Function
Transmembrane RegionsNot Available
GenBank Protein IDNot Available
UniProtKB IDP07237
UniProtKB Entry NamePDIA1_HUMAN
Cellular LocationEndoplasmic reticulum
Gene sequence
>lcl|BSEQ0019292|Protein disulfide-isomerase (P4HB)
ATGCTGCGCCGCGCTCTGCTGTGCCTGGCCGTGGCCGCCCTGGTGCGCGCCGACGCCCCC
GAGGAGGAGGACCACGTCCTGGTGCTGCGGAAAAGCAACTTCGCGGAGGCGCTGGCGGCC
CACAAGTACCTGCTGGTGGAGTTCTATGCCCCTTGGTGTGGCCACTGCAAGGCTCTGGCC
CCTGAGTATGCCAAAGCCGCTGGGAAGCTGAAGGCAGAAGGTTCCGAGATCAGGTTGGCC
AAGGTGGACGCCACGGAGGAGTCTGACCTGGCCCAGCAGTACGGCGTGCGCGGCTATCCC
ACCATCAAGTTCTTCAGGAATGGAGACACGGCTTCCCCCAAGGAATATACAGCTGGCAGA
GAGGCTGATGACATCGTGAACTGGCTGAAGAAGCGCACGGGCCCGGCTGCCACCACCCTG
CCTGACGGCGCAGCTGCAGAGTCCTTGGTGGAGTCCAGCGAGGTGGCTGTCATCGGCTTC
TTCAAGGACGTGGAGTCGGACTCTGCCAAGCAGTTTTTGCAGGCAGCAGAGGCCATCGAT
GACATACCATTTGGGATCACTTCCAACAGTGACGTGTTCTCCAAATACCAGCTCGACAAA
GATGGGGTTGTCCTCTTTAAGAAGTTTGATGAAGGCCGGAACAACTTTGAAGGGGAGGTC
ACCAAGGAGAACCTGCTGGACTTTATCAAACACAACCAGCTGCCCCTTGTCATCGAGTTC
ACCGAGCAGACAGCCCCGAAGATTTTTGGAGGTGAAATCAAGACTCACATCCTGCTGTTC
TTGCCCAAGAGTGTGTCTGACTATGACGGCAAACTGAGCAACTTCAAAACAGCAGCCGAG
AGCTTCAAGGGCAAGATCCTGTTCATCTTCATCGACAGCGACCACACCGACAACCAGCGC
ATCCTCGAGTTCTTTGGCCTGAAGAAGGAAGAGTGCCCGGCCGTGCGCCTCATCACCCTG
GAGGAGGAGATGACCAAGTACAAGCCCGAATCGGAGGAGCTGACGGCAGAGAGGATCACA
GAGTTCTGCCACCGCTTCCTGGAGGGCAAAATCAAGCCCCACCTGATGAGCCAGGAGCTG
CCGGAGGACTGGGACAAGCAGCCTGTCAAGGTGCTTGTTGGGAAGAACTTTGAAGACGTG
GCTTTTGATGAGAAAAAAAACGTCTTTGTGGAGTTCTATGCCCCATGGTGTGGTCACTGC
AAACAGTTGGCTCCCATTTGGGATAAACTGGGAGAGACGTACAAGGACCATGAGAACATC
GTCATCGCCAAGATGGACTCGACTGCCAACGAGGTGGAGGCCGTCAAAGTGCACAGCTTC
CCCACACTCAAGTTCTTTCCTGCCAGTGCCGACAGGACGGTCATTGATTACAACGGGGAA
CGCACGCTGGATGGTTTTAAGAAATTCCTGGAGAGCGGTGGCCAGGATGGGGCAGGGGAT
GATGACGATCTCGAGGACCTGGAAGAAGCAGAGGAGCCAGACATGGAGGAAGACGATGAT
CAGAAAGCTGTGAAAGATGAACTGTAA
GenBank Gene IDX05130
GeneCard IDNot Available
GenAtlas IDP4HB
HGNC IDHGNC:8548
Chromosome Location17
Locus17q25
References
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