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Protein

Protein disulfide-isomerase

Gene

P4HB

Organism
Pongo abelii (Sumatran orangutan) (Pongo pygmaeus abelii)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at transcript leveli

Functioni

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, 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.By similarity

Catalytic activityi

Catalyzes the rearrangement of -S-S- bonds in proteins.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Active sitei53NucleophileBy similarity1
Sitei54Contributes to redox potential valueBy similarity1
Sitei55Contributes to redox potential valueBy similarity1
Active sitei56NucleophileBy similarity1
Sitei120Lowers pKa of C-terminal Cys of first active siteBy similarity1
Active sitei397NucleophileBy similarity1
Sitei398Contributes to redox potential valueBy similarity1
Sitei399Contributes to redox potential valueBy similarity1
Active sitei400NucleophileBy similarity1
Sitei461Lowers pKa of C-terminal Cys of second active siteBy similarity1

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Chaperone, Isomerase

Names & Taxonomyi

Protein namesi
Recommended name:
Protein disulfide-isomerase (EC:5.3.4.1)
Short name:
PDI
Alternative name(s):
Cellular thyroid hormone-binding protein
Prolyl 4-hydroxylase subunit beta
p55
Gene namesi
Name:P4HB
Synonyms:PDIA1
OrganismiPongo abelii (Sumatran orangutan) (Pongo pygmaeus abelii)
Taxonomic identifieri9601 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaePongo
Proteomesi
  • UP000001595 Componenti: Unplaced

Subcellular locationi

  • Endoplasmic reticulum By similarity
  • Endoplasmic reticulum lumen By similarity
  • Melanosome By similarity
  • Cell membrane By similarity; Peripheral membrane protein Curated

  • 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.By similarity

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cell membrane, Endoplasmic reticulum, Membrane

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Signal peptidei1 – 17By similarityAdd BLAST17
ChainiPRO_000003419718 – 508Protein disulfide-isomeraseAdd BLAST491

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Disulfide bondi53 ↔ 56Redox-activePROSITE-ProRule annotation
Modified residuei200N6-acetyllysineBy similarity1
Modified residuei222N6-succinyllysineBy similarity1
Modified residuei271N6-succinyllysineBy similarity1
Modified residuei357PhosphoserineBy similarity1
Disulfide bondi397 ↔ 400Redox-activePROSITE-ProRule annotation

Keywords - PTMi

Acetylation, Disulfide bond, Phosphoprotein

Proteomic databases

PRIDEiQ5R5B6.

Interactioni

Subunit structurei

Heterodimer; heterodimerizes with the protein microsomal triglyceride transfer MTTP. Homodimer. Monomers and homotetramers may also occur. Also constitutes the structural subunit of prolyl 4-hydroxylase and of the microsomal triacylglycerol transfer protein MTTP in mammalian cells. Stabilizes both enzymes and retain them in the ER without contributing to the catalytic activity. Binds UBQLN1. Interacts with ERO1B.By similarity

GO - Molecular functioni

Protein-protein interaction databases

STRINGi9601.ENSPPYP00000009818.

Structurei

3D structure databases

ProteinModelPortaliQ5R5B6.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini18 – 134Thioredoxin 1PROSITE-ProRule annotationAdd BLAST117
Domaini349 – 475Thioredoxin 2PROSITE-ProRule annotationAdd BLAST127

Motif

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Motifi505 – 508Prevents secretion from ERPROSITE-ProRule annotation4

Compositional bias

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Compositional biasi480 – 483Poly-Asp4

Sequence similaritiesi

Belongs to the protein disulfide isomerase family.Curated
Contains 2 thioredoxin domains.PROSITE-ProRule annotation

Keywords - Domaini

Redox-active center, Repeat, Signal

Phylogenomic databases

eggNOGiKOG0190. Eukaryota.
COG0526. LUCA.
HOVERGENiHBG005920.
InParanoidiQ5R5B6.
KOiK09580.

Family and domain databases

Gene3Di3.40.30.10. 4 hits.
InterProiIPR005788. Disulphide_isomerase.
IPR005792. Prot_disulphide_isomerase.
IPR012336. Thioredoxin-like_fold.
IPR017937. Thioredoxin_CS.
IPR013766. Thioredoxin_domain.
[Graphical view]
PfamiPF00085. Thioredoxin. 2 hits.
[Graphical view]
SUPFAMiSSF52833. SSF52833. 4 hits.
TIGRFAMsiTIGR01130. ER_PDI_fam. 1 hit.
TIGR01126. pdi_dom. 2 hits.
PROSITEiPS00014. ER_TARGET. 1 hit.
PS00194. THIOREDOXIN_1. 2 hits.
PS51352. THIOREDOXIN_2. 2 hits.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q5R5B6-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MLRRALLCLA VAGLVCADAP EEEDHVLVLR KSNFAEALAA HKYLLVEFYA
60 70 80 90 100
PWCGHCKALA PEYAKAAGKL KAEGSEIRLA KVDATEESDL AQQYGVRGYP
110 120 130 140 150
TIKFFRNGDT ASPKEYTAGR EADDIVNWLK KRTGPAATIL PDGAAAESLV
160 170 180 190 200
ESSEVAVVGF FKDVESDSAK QFLQAAEAID DIPFGITSNS DVFSKYQLDK
210 220 230 240 250
DGVVLFKKFD EGRNNFEGEV TKENLLDFIK HNQLPLVIEF TEQTAPKIFG
260 270 280 290 300
GEIKTHILLF LPKSVSDYDG KLSNFKTAAE SFKGKILFIF IDSDHTDNQR
310 320 330 340 350
ILEFFGLKKE ECPAVRLITL EEEMTKYKPE SEELTAERIT EFCHRFLEGK
360 370 380 390 400
IKPHLMSQEL PDDWDKQPVK VLVGKNFEDV AFDEKKNVFV EFYAPWCGHC
410 420 430 440 450
KQLAPIWDKL GETYKDHENI VIAKMDSTAN EVEAVKVHSF PTLKFFPASA
460 470 480 490 500
DRTVIDYNGE RTLDGFKKFL ESGGQDGAGD DDDLEDLEEA EEPDMEEDDD

QKAVKDEL
Length:508
Mass (Da):57,033
Last modified:December 21, 2004 - v1
Checksum:i114D79D9BC740400
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CR860947 mRNA. Translation: CAH93050.1.
RefSeqiNP_001126805.1. NM_001133333.1.

Genome annotation databases

GeneIDi100173809.
KEGGipon:100173809.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
CR860947 mRNA. Translation: CAH93050.1.
RefSeqiNP_001126805.1. NM_001133333.1.

3D structure databases

ProteinModelPortaliQ5R5B6.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi9601.ENSPPYP00000009818.

Proteomic databases

PRIDEiQ5R5B6.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi100173809.
KEGGipon:100173809.

Organism-specific databases

CTDi5034.

Phylogenomic databases

eggNOGiKOG0190. Eukaryota.
COG0526. LUCA.
HOVERGENiHBG005920.
InParanoidiQ5R5B6.
KOiK09580.

Family and domain databases

Gene3Di3.40.30.10. 4 hits.
InterProiIPR005788. Disulphide_isomerase.
IPR005792. Prot_disulphide_isomerase.
IPR012336. Thioredoxin-like_fold.
IPR017937. Thioredoxin_CS.
IPR013766. Thioredoxin_domain.
[Graphical view]
PfamiPF00085. Thioredoxin. 2 hits.
[Graphical view]
SUPFAMiSSF52833. SSF52833. 4 hits.
TIGRFAMsiTIGR01130. ER_PDI_fam. 1 hit.
TIGR01126. pdi_dom. 2 hits.
PROSITEiPS00014. ER_TARGET. 1 hit.
PS00194. THIOREDOXIN_1. 2 hits.
PS51352. THIOREDOXIN_2. 2 hits.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiPDIA1_PONAB
AccessioniPrimary (citable) accession number: Q5R5B6
Entry historyi
Integrated into UniProtKB/Swiss-Prot: March 29, 2005
Last sequence update: December 21, 2004
Last modified: October 5, 2016
This is version 83 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.