View source for 7xyx


==Crystal structure of ZYG11B bound to CFLH degron==
<StructureSection load='7xyx' size='340' side='right'caption='[[7xyx]], [[Resolution|resolution]] 2.87&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7xyx]] is a 2 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=7XYX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7XYX 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]] 2.87&#8491;</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=7xyx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7xyx OCA], [https://pdbe.org/7xyx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7xyx RCSB], [https://www.ebi.ac.uk/pdbsum/7xyx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7xyx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ZY11B_HUMAN ZY11B_HUMAN] Serves as substrate adapter subunit in the E3 ubiquitin ligase complex ZYG11B-CUL2-Elongin BC. Acts redudantly with ZER1 to target substrates bearing N-terminal glycine degrons for proteasomal degradation (PubMed:33093214). Involved in the clearance of proteolytic fragments generated by caspase cleavage during apoptosis since N-terminal glycine degrons are strongly enriched at caspase cleavage sites. Also important in the quality control of protein N-myristoylation in which N-terminal glycine degrons are conditionally exposed after a failure of N-myristoylation (PubMed:31273098).<ref>PMID:31273098</ref> <ref>PMID:33093214</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
N-degron pathway plays an important role in the protein quality control and maintenance of cellular protein homeostasis. ZER1 and ZYG11B, the substrate receptors of the Cullin 2-RING E3 ubiquitin ligase (CRL2), recognize N-terminal (Nt) glycine degrons and participate in the Nt-myristoylation quality control through the Gly/N-degron pathway. Here we show that ZER1 and ZYG11B can also recognize small Nt-residues other than glycine. Specifically, ZER1 binds better to Nt-Ser, -Ala, -Thr and -Cys than to -Gly, while ZYG11B prefers Nt-Gly but also has the capacity to recognize Nt-Ser, -Ala and -Cys in vitro. We found that Nt-Ser, -Ala and -Cys undergo Nt-acetylation catalyzed by Nt-acetyltransferase (NAT), thereby shielding them from recognition by ZER1/ZYG11B in cells. Instead, ZER1/ZYG11B readily targets a selection of small Nt-residues lacking Nt-acetylation for degradation in NAT-deficient cells, implicating its role in the Nt-acetylation quality control. Furthermore, we present the crystal structures of ZER1 and ZYG11B bound to various small Nt-residues and uncover the molecular mechanism of non-acetylated substrate recognition by ZER1 and ZYG11B.

CRL2(ZER1/ZYG11B) recognizes small N-terminal residues for degradation.,Li Y, Zhao Y, Yan X, Ye C, Weirich S, Zhang B, Wang X, Song L, Jiang C, Jeltsch A, Dong C, Mi W Nat Commun. 2022 Dec 10;13(1):7636. doi: 10.1038/s41467-022-35169-6. PMID:36496439<ref>PMID:36496439</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 7xyx" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Dong C]]
[[Category: Li Y]]
[[Category: Yan X]]