HLA-DQA1

Protein identityUniProt · HPA

UniProt accession

P01909

Gene

HLA-DQA1

Ensembl

ENSG00000196735

Chromosome

6

Canonical length

254 aa

Protein class

Human disease related genes, Predicted intracellular proteins, Predicted membrane proteins, Transporters

Quaternary structure

Homotrimer

OverviewNCBI Gene

HLA-DQA1 belongs to the HLA class II alpha chain paralogues. The class II molecule is a heterodimer consisting of an alpha (DQA) and a beta chain (DQB), both anchored in the membrane. It plays a central role in the immune system by presenting peptides derived from extracellular proteins. Class II molecules are expressed in antigen presenting cells (APC: B Lymphocytes, dendritic cells, macrophages). The alpha chain is approximately 33-35 kDa. It is encoded by 5 exons; exon 1 encodes the leader peptide, exons 2 and 3 encode the two extracellular domains, and exon 4 encodes the transmembrane domain and the cytoplasmic tail. Within the DQ molecule both the alpha chain and the beta chain contain the polymorphisms specifying the peptide binding specificities, resulting in up to four different molecules. Typing for these polymorphisms is routinely done for bone marrow transplantation. [provided by RefSeq, Jul 2008]

Canonical amino-acid sequenceUniProt

254 residues, UniProt reviewed canonical sequence.

>P01909|HLA-DQA1
     1  MILNKALMLG ALALTTVMSP CGGEDIVADH VASYGVNLYQ SYGPSGQYTH EFDGDEQFYV
    61  DLGRKETVWC LPVLRQFRFD PQFALTNIAV LKHNLNSLIK RSNSTAATNE VPEVTVFSKS
   121  PVTLGQPNIL ICLVDNIFPP VVNITWLSNG HSVTEGVSET SFLSKSDHSF FKISYLTLLP
   181  SAEESYDCKV EHWGLDKPLL KHWEPEIPAP MSELTETVVC ALGLSVGLVG IVVGTVFIIR
   241  GLRSVGASRH QGPL

LocalizationUniProt · AlphaFold · HPA

Whether an antibody against HLA-DQA1 can act on the native protein depends on physical access: surface and secreted proteins are reachable by circulating antibodies, intracellular proteins usually are not.

Antibody reachability

Cell surface

Secreted

No

Transmembrane segments

1

Mean surface accessibility (rSASA)

0.4

Highest tissue expression

314 nTPM

Expression across tissuesHPA

Genetic constraint and essentialitygnomAD · DepMap

Does the body need this protein intact? Low LOEUF or a strong DepMap dependency means loss or blockade of the protein is likely to be felt.

gnomAD LOEUF (loss-of-function intolerance)

0.97

gnomAD pLI

0.02

gnomAD missense Z

1.63

DepMap mean gene effect

0.08

DepMap dependency class

none

OntologyGO

Biological processes

• adaptive immune response
• antigen processing and presentation of exogenous peptide antigen via MHC class II
• immune response
• peptide antigen assembly with MHC class II protein complex
• positive regulation of immune response
• positive regulation of T cell activation

Molecular functions

• MHC class II protein complex binding
• MHC class II receptor activity
• peptide antigen binding

Cellular components

• clathrin-coated endocytic vesicle membrane
• endocytic vesicle membrane
• ER to Golgi transport vesicle membrane
• Golgi membrane
• late endosome membrane
• lumenal side of endoplasmic reticulum membrane
• lysosomal membrane
• membrane
• MHC class II protein complex
• plasma membrane
• trans-Golgi network membrane
• transport vesicle membrane

Protein domainsUniProt · Pfam · InterPro

• MHC class II, alpha chain, N-terminal
• Immunoglobulin/major histocompatibility complex, conserved site
• Immunoglobulin C1-set
• Immunoglobulin-like domain
• MHC classes I/II-like antigen recognition protein
• Immunoglobulin-like fold
• MHC class II, alpha/beta chain, N-terminal
• Immunoglobulin-like domain superfamily
• Major Histocompatibility Complex/Immunoglobulin
• Class II histocompatibility antigen, alpha domain
• Immunoglobulin C1-set domain

KeywordsUniProt

• Adaptive immunity
• Cell membrane
• Disulfide bond
• Endoplasmic reticulum
• Endosome
• Glycoprotein
• Golgi apparatus
• Immunity
• Lysosome
• Membrane
• MHC II
• Signal
• Transmembrane
• Transmembrane helix