View source for 6kgj


==M1Q-hNTAQ1 C28S==
<StructureSection load='6kgj' size='340' side='right'caption='[[6kgj]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6kgj]] 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=6KGJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6KGJ 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]] 1.8&#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=6kgj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6kgj OCA], [https://pdbe.org/6kgj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6kgj RCSB], [https://www.ebi.ac.uk/pdbsum/6kgj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6kgj ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/NTAQ1_HUMAN NTAQ1_HUMAN] Mediates the side-chain deamidation of N-terminal glutamine residues to glutamate, an important step in N-end rule pathway of protein degradation. Conversion of the resulting N-terminal glutamine to glutamate renders the protein susceptible to arginylation, polyubiquitination and degradation as specified by the N-end rule. Does not act on substrates with internal or C-terminal glutamine and does not act on non-glutamine residues in any position. Does not deaminate acetylated N-terminal glutamine. With the exception of proline, all tested second-position residues on substrate peptides do not greatly influence the activity. In contrast, a proline at position 2, virtually abolishes deamidation of N-terminal glutamine (By similarity).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The N-degron pathway, formerly the N-end rule pathway, is a protein degradation process that determines the half-life of proteins based on their N-terminal residues. In contrast to the well-established in vivo studies over decades, in vitro studies of this pathway, including biochemical characterization and high-resolution structures, are relatively limited. In this study, we have developed a unique fusion technique using microtubule-associated protein 1A/1B light chain 3B, a key marker protein of autophagy, to tag the N-terminus of the proteins involved in the N-degron pathway, which enables high yield of homogeneous target proteins with variable N-terminal residues for diverse biochemical studies including enzymatic and binding assays and substrate identification. Intriguingly, crystallization showed a markedly enhanced probability, even for the N-degron complexes. To validate our results, we determined the structures of select proteins in the N-degron pathway and compared them to the PDB-deposited proteins. Furthermore, several biochemical applications of this technique were introduced. Therefore, this technique can be used as a general tool for the in vitro study of the N-degron pathway.

Use of the LC3B-fusion technique for biochemical and structural studies of proteins involved in the N-degron pathway.,Kim L, Kwon DH, Heo J, Park MR, Song HK J Biol Chem. 2020 Jan 9. pii: RA119.010912. doi: 10.1074/jbc.RA119.010912. PMID:31919097<ref>PMID:31919097</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6kgj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Kim L]]
[[Category: Kwon DH]]
[[Category: Park MR]]
[[Category: Song HK]]