antigen processing and presentation of endogenous peptide antigen via MHC class Ib via ER pathway, TAP-dependent / ABC-type peptide transporter activity / tapasin binding / ABC-type antigen peptide transporter / ABC-type peptide antigen transporter activity / TAP complex / TAP1 binding / oligopeptide export from mitochondrion / TAP2 binding / peptide antigen transport ...antigen processing and presentation of endogenous peptide antigen via MHC class Ib via ER pathway, TAP-dependent / ABC-type peptide transporter activity / tapasin binding / ABC-type antigen peptide transporter / ABC-type peptide antigen transporter activity / TAP complex / TAP1 binding / oligopeptide export from mitochondrion / TAP2 binding / peptide antigen transport / MHC class Ib protein binding / cytosol to endoplasmic reticulum transport / ABC-type oligopeptide transporter activity / peptide transport / peptide transmembrane transporter activity / MHC class I protein binding / antigen processing and presentation of endogenous peptide antigen via MHC class I via ER pathway, TAP-dependent / centriolar satellite / endoplasmic reticulum-Golgi intermediate compartment membrane / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent / response to molecule of bacterial origin / MHC class I peptide loading complex / T cell mediated cytotoxicity / transmembrane transport / antigen processing and presentation of endogenous peptide antigen via MHC class I / ADP binding / defense response / positive regulation of T cell mediated cytotoxicity / phagocytic vesicle membrane / peptide antigen binding / protein transport / ER-Phagosome pathway / adaptive immune response / mitochondrial inner membrane / nuclear speck / endoplasmic reticulum membrane / endoplasmic reticulum / protein homodimerization activity / ATP hydrolysis activity / ATP binding / membrane / metal ion binding Similarity search - Function
Antigen peptide transporter 2 / ABC transporter Tap-like / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter ...Antigen peptide transporter 2 / ABC transporter Tap-like / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase Similarity search - Domain/homology
Journal: Proc Natl Acad Sci U S A / Year: 2024 Title: Principles of peptide selection by the transporter associated with antigen processing. Authors: James Lee / Michael L Oldham / Victor Manon / Jue Chen / Abstract: Our ability to fight pathogens relies on major histocompatibility complex class I (MHC-I) molecules presenting diverse antigens on the surface of diseased cells. The transporter associated with ...Our ability to fight pathogens relies on major histocompatibility complex class I (MHC-I) molecules presenting diverse antigens on the surface of diseased cells. The transporter associated with antigen processing (TAP) transports nearly the entire repertoire of antigenic peptides into the endoplasmic reticulum for MHC-I loading. How TAP transports peptides specific for MHC-I is unclear. In this study, we used cryo-EM to determine a series of structures of human TAP, both in the absence and presence of peptides with various sequences and lengths. The structures revealed that peptides of eight or nine residues in length bind in a similarly extended conformation, despite having little sequence overlap. We also identified two peptide-anchoring pockets on either side of the transmembrane cavity, each engaging one end of a peptide with primarily main chain atoms. Occupation of both pockets results in a global conformational change in TAP, bringing the two halves of the transporter closer together to prime it for isomerization and ATP hydrolysis. Shorter peptides are able to bind to each pocket separately but are not long enough to bridge the cavity to bind to both simultaneously. Mutations that disrupt hydrogen bonds with the N and C termini of peptides almost abolish MHC-I surface expression. Our findings reveal that TAP functions as a molecular caliper that selects peptides according to length rather than sequence, providing antigen diversity for MHC-I presentation.
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