9c96: Difference between revisions
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New page: '''Unreleased structure''' The entry 9c96 is ON HOLD Authors: Description: Category: Unreleased Structures |
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The | ==Cryo-EM structure of TAP binding protein related (TAPBPR) in complex with HLA-A*02:01 bound to a suboptimal peptide.== | ||
<StructureSection load='9c96' size='340' side='right'caption='[[9c96]], [[Resolution|resolution]] 3.00Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[9c96]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9C96 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9C96 FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3Å</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=9c96 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9c96 OCA], [https://pdbe.org/9c96 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9c96 RCSB], [https://www.ebi.ac.uk/pdbsum/9c96 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9c96 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q8WLS4_HUMAN Q8WLS4_HUMAN] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Class I major histocompatibility complex (MHC-I) proteins play a pivotal role in adaptive immunity by displaying epitopic peptides to CD8+ T cells. The chaperones tapasin and TAPBPR promote the selection of immunogenic antigens from a large pool of intracellular peptides. Interactions of chaperoned MHC-I molecules with incoming peptides are transient in nature, and as a result, the precise antigen proofreading mechanism remains elusive. Here, we leverage a high-fidelity TAPBPR variant and conformationally stabilized MHC-I, to determine the solution structure of the human antigen editing complex bound to a peptide decoy by cryogenic electron microscopy (cryo-EM) at an average resolution of 3.0 A. Antigen proofreading is mediated by transient interactions formed between the nascent peptide binding groove with the P2/P3 peptide anchors, where conserved MHC-I residues stabilize incoming peptides through backbone-focused contacts. Finally, using our high-fidelity chaperone, we demonstrate robust peptide exchange on the cell surface across multiple clinically relevant human MHC-I allomorphs. Our work has important ramifications for understanding the selection of immunogenic epitopes for T cell screening and vaccine design applications. | |||
CryoEM structure of an MHC-I/TAPBPR peptide-bound intermediate reveals the mechanism of antigen proofreading.,Sun Y, Pumroy RA, Mallik L, Chaudhuri A, Wang C, Hwang D, Danon JN, Dasteh Goli K, Moiseenkova-Bell VY, Sgourakis NG Proc Natl Acad Sci U S A. 2025 Jan 14;122(2):e2416992122. doi: , 10.1073/pnas.2416992122. Epub 2025 Jan 9. PMID:39786927<ref>PMID:39786927</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 9c96" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | |||
[[Category: Mallik L]] | |||
[[Category: Moiseenkova-Bell YV]] | |||
[[Category: Pumroy RP]] | |||
[[Category: Sgourakis N]] | |||
[[Category: Sun Y]] | |||
