InnateDB: Systems Biology of the Innate Immune Response

Homo sapiens Protein: TAP2

Summary

InnateDB Protein

IDBP-81451.6

Last Modified

2014-10-13 [Report errors or provide feedback]

Gene Symbol

TAP2

Protein Name

transporter 2, ATP-binding cassette, sub-family B (MDR/TAP)

Synonyms

ABC18; ABCB3; APT2; D6S217E; PSF-2; PSF2; RING11;

Species

Homo sapiens

Ensembl Protein

ENSP00000364034

InnateDB Gene

IDBG-81449 (TAP2)

Protein Structure

UniProt Annotation

Function

Involved in the transport of antigens from the cytoplasm to the endoplasmic reticulum for association with MHC class I molecules. Also acts as a molecular scaffold for the final stage of MHC class I folding, namely the binding of peptide. Nascent MHC class I molecules associate with TAP via tapasin. Inhibited by the covalent attachment of herpes simplex virus ICP47 protein, which blocks the peptide-binding site of TAP. Inhibited by human cytomegalovirus US6 glycoprotein, which binds to the lumenal side of the TAP complex and inhibits peptide translocation by specifically blocking ATP-binding to TAP1 and prevents the conformational rearrangement of TAP induced by peptide binding. Inhibited by human adenovirus E3-19K glycoprotein, which binds the TAP complex and acts as a tapasin inhibitor, preventing MHC class I/TAP association.

Subcellular Localization

Endoplasmic reticulum membrane; Multi-pass membrane protein. Note=The transmembrane segments seem to form a pore in the membrane.

Disease Associations

Bare lymphocyte syndrome 1 (BLS1) [MIM:604571]: A HLA class I deficiency. Contrary to bare lymphocyte syndromes type 2 and type 3, which are characterized by early-onset severe combined immunodeficiency, class I antigen deficiencies are not accompanied by particular pathologic manifestations during the first years of life. Systemic infections have not been described. Chronic bacterial infections, often beginning in the first decade of life, are restricted to the respiratory tract. {ECO:0000269PubMed:7517574}. Note=The disease is caused by mutations affecting the gene represented in this entry.

Tissue Specificity

Comments

Interactions

Number of Interactions

This gene and/or its encoded proteins are associated with 18 experimentally validated interaction(s) in this database.
They are also associated with 2 interaction(s) predicted by orthology.

Experimentally validated
Total	18 [view]
Protein-Protein	16 [view]
Protein-DNA	2 [view]
Protein-RNA	0
DNA-DNA	0
RNA-RNA	0
DNA-RNA	0

Predicted by orthology
Total	2 [view]

Gene Ontology

Molecular Function

Accession	GO Term
GO:0005215	transporter activity
GO:0005515	protein binding
GO:0005524	ATP binding
GO:0015197	peptide transporter activity
GO:0015433	peptide antigen-transporting ATPase activity
GO:0016887	ATPase activity
GO:0023029	MHC class Ib protein binding
GO:0042626	ATPase activity, coupled to transmembrane movement of substances
GO:0046978	TAP1 binding
GO:0046980	tapasin binding

Biological Process

GO:0002474	antigen processing and presentation of peptide antigen via MHC class I
GO:0002479	antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent
GO:0002481	antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent
GO:0002485	antigen processing and presentation of endogenous peptide antigen via MHC class I via ER pathway, TAP-dependent
GO:0002489	antigen processing and presentation of endogenous peptide antigen via MHC class Ib via ER pathway, TAP-dependent
GO:0002591	positive regulation of antigen processing and presentation of peptide antigen via MHC class I
GO:0006200	ATP catabolic process
GO:0006810	transport
GO:0019060	intracellular transport of viral protein in host cell
GO:0019885	antigen processing and presentation of endogenous peptide antigen via MHC class I
GO:0042590	antigen processing and presentation of exogenous peptide antigen via MHC class I
GO:0046967	cytosol to ER transport
GO:0046968	peptide antigen transport
GO:0055085	transmembrane transport

Cellular Component

GO:0005789	endoplasmic reticulum membrane
GO:0016020	membrane
GO:0016021	integral component of membrane
GO:0030176	integral component of endoplasmic reticulum membrane
GO:0042825	TAP complex

Protein Structure and Domains

PDB ID

InterPro

IPR001140 ABC transporter, transmembrane domain
IPR003439 ABC transporter-like
IPR003593 AAA+ ATPase domain
IPR005293 Antigen peptide transporter 2
IPR011527 ABC transporter type 1, transmembrane domain
IPR013305 ABC transporter, ABCB2
IPR013306 ABC transporter, B3
IPR027417 P-loop containing nucleoside triphosphate hydrolase

PFAM

PF00664
PF13748
PF00005

PRINTS

PR01896
PR01897

PIRSF

SMART

SM00382

TIGRFAMs

Post-translational Modifications

Modification

Cross-References

SwissProt