4a3t: Difference between revisions
New page: '''Unreleased structure''' The entry 4a3t is ON HOLD Authors: Richet, N., Barrault, M.B., Godart, C., Murciano, B., Le Tallec, B., Rousseau, E., Ledu, M.H., Charbonnier, J.B., Legrand, ... |
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The | ==yeast regulatory particle proteasome assembly chaperone Hsm3== | ||
<StructureSection load='4a3t' size='340' side='right'caption='[[4a3t]], [[Resolution|resolution]] 2.10Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4a3t]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_W303 Saccharomyces cerevisiae W303]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4A3T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4A3T FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1Å</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=4a3t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4a3t OCA], [https://pdbe.org/4a3t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4a3t RCSB], [https://www.ebi.ac.uk/pdbsum/4a3t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4a3t ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/HSM3_YEAST HSM3_YEAST] Involved in DNA mismatch repair in slow-growing cells. Acts as a chaperone during the assembly of the 26S proteasome, specifically of the base subcomplex of the 19S regulatory complex (RC).<ref>PMID:9539417</ref> <ref>PMID:10681182</ref> <ref>PMID:10681183</ref> <ref>PMID:15450405</ref> <ref>PMID:19446322</ref> <ref>PMID:19217412</ref> <ref>PMID:19412159</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The 26S proteasome, a molecular machine responsible for regulated protein degradation, consists of a proteolytic core particle (20S CP) associated with 19S regulatory particles (19S RPs) subdivided into base and lid subcomplexes. The assembly of 19S RP base subcomplex is mediated by multiple dedicated chaperones. Among these, Hsm3 is important for normal growth and directly targets the carboxyl-terminal (C-terminal) domain of Rpt1 of the Rpt1-Rpt2-Rpn1 assembly intermediate. Here, we report crystal structures of the yeast Hsm3 chaperone free and bound to the C-terminal domain of Rpt1. Unexpectedly, the structure of the complex suggests that within the Hsm3-Rpt1-Rpt2 module, Hsm3 also contacts Rpt2. We show that in both yeast and mammals, Hsm3 actually directly binds the AAA domain of Rpt2. The Hsm3 C-terminal region involved in this interaction is required in vivo for base assembly, although it is dispensable for binding Rpt1. Although Rpt1 and Rpt2 exhibit weak affinity for each other, Hsm3 unexpectedly acts as an essential matchmaker for the Rpt1-Rpt2-Rpn1 assembly by bridging both Rpt1 and Rpt2. In addition, we provide structural and biochemical evidence on how Hsm3/S5b may regulate the 19S RP association to the 20S CP proteasome. Our data point out the diverse functions of assembly chaperones. | |||
Dual functions of the Hsm3 protein in chaperoning and scaffolding regulatory particle subunits during the proteasome assembly.,Barrault MB, Richet N, Godard C, Murciano B, Le Tallec B, Rousseau E, Legrand P, Charbonnier JB, Le Du MH, Guerois R, Ochsenbein F, Peyroche A Proc Natl Acad Sci U S A. 2012 Mar 29. PMID:22460800<ref>PMID:22460800</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4a3t" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[DNA mismatch repair protein 3D structures|DNA mismatch repair protein 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Saccharomyces cerevisiae W303]] | |||
[[Category: Barrault MB]] | |||
[[Category: Charbonnier JB]] | |||
[[Category: Godart C]] | |||
[[Category: Guerois R]] | |||
[[Category: Le Tallec B]] | |||
[[Category: Ledu MH]] | |||
[[Category: Legrand P]] | |||
[[Category: Murciano B]] | |||
[[Category: Ochsenbein F]] | |||
[[Category: Peyroche A]] | |||
[[Category: Richet N]] | |||
[[Category: Rousseau E]] | |||