5e7s: Difference between revisions
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The | ==Hexameric structure of a LonA protease domain in active state== | ||
<StructureSection load='5e7s' size='340' side='right'caption='[[5e7s]], [[Resolution|resolution]] 3.03Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5e7s]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Meiothermus_taiwanensis Meiothermus taiwanensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5E7S OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5E7S 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]] 3.03Å</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=5e7s FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5e7s OCA], [https://pdbe.org/5e7s PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5e7s RCSB], [https://www.ebi.ac.uk/pdbsum/5e7s PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5e7s ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/A0A059VAZ3_9DEIN A0A059VAZ3_9DEIN] ATP-dependent serine protease that mediates the selective degradation of mutant and abnormal proteins as well as certain short-lived regulatory proteins. Required for cellular homeostasis and for survival from DNA damage and developmental changes induced by stress. Degrades polypeptides processively to yield small peptide fragments that are 5 to 10 amino acids long. Binds to DNA in a double-stranded, site-specific manner.[HAMAP-Rule:MF_01973] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The Lon AAA+ protease (LonA) plays important roles in protein homeostasis and regulation of diverse biological processes. LonA behaves as a homomeric hexamer in the presence of magnesium (Mg(2+)) and performs ATP-dependent proteolysis. However, it is also found that LonA can carry out Mg(2+)-dependent degradation of unfolded protein substrate in an ATP-independent manner. Here we show that in the presence of Mg(2+) LonA forms a non-secluded hexameric barrel with prominent openings, which explains why Mg(2+)-activated LonA can operate as a diffusion-based chambered protease to degrade unstructured protein and peptide substrates efficiently in the absence of ATP. A 1.85 A crystal structure of Mg(2+)-activated protease domain reveals Mg(2+)-dependent remodeling of a substrate-binding loop and a potential metal-binding site near the Ser-Lys catalytic dyad, supported by biophysical binding assays and molecular dynamics simulations. Together, these findings reveal the specific roles of Mg(2+) in the molecular assembly and activation of LonA. | |||
Structural Basis for the Magnesium-Dependent Activation and Hexamerization of the Lon AAA+ Protease.,Su SC, Lin CC, Tai HC, Chang MY, Ho MR, Babu CS, Liao JH, Wu SH, Chang YC, Lim C, Chang CI Structure. 2016 May 3;24(5):676-86. doi: 10.1016/j.str.2016.03.003. Epub 2016 Mar, 31. PMID:27041593<ref>PMID:27041593</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: | <div class="pdbe-citations 5e7s" style="background-color:#fffaf0;"></div> | ||
[[Category: Lin | == References == | ||
[[Category: | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Meiothermus taiwanensis]] | |||
[[Category: Chang C-I]] | |||
[[Category: Lin C-C]] | |||
[[Category: Su S-C]] | |||