4mmj: Difference between revisions
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''' | ==crystal structure of YafQ from E.coli strain BL21(DE3)== | ||
<StructureSection load='4mmj' size='340' side='right' caption='[[4mmj]], [[Resolution|resolution]] 1.80Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4mmj]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4MMJ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4MMJ FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br> | |||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4mmg|4mmg]], [[4ml2|4ml2]], [[4ml0|4ml0]]</td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4mmj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4mmj OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4mmj RCSB], [http://www.ebi.ac.uk/pdbsum/4mmj PDBsum]</span></td></tr> | |||
<table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Toxin YafQ functions as a ribonuclease in the dinJ-yafQ toxin-antitoxin system of Escherichia coli. Antitoxin DinJ neutralizes YafQ-mediated toxicity by forming a stable protein complex. Here, crystal structures of the (DinJ)2-(YafQ)2 complex and the isolated YafQ toxin have been determined. The structure of the heterotetrameric complex (DinJ)2-(YafQ)2 revealed that the N-terminal region of DinJ folds into a ribbon-helix-helix motif and dimerizes for DNA recognition, and the C-terminal portion of each DinJ exclusively wraps around a YafQ molecule. Upon incorporation into the heterotetrameric complex, a conformational change of YafQ in close proximity to the catalytic site of the typical microbial ribonuclease fold was observed and validated. Mutagenesis experiments revealed that a DinJ mutant restored YafQ RNase activity in a tetramer complex in vitro, but not in vivo. An electrophoretic mobility shift assay showed that one of the palindromic sequences present in the upstream intergenic region of DinJ served as a binding sequences for both the DinJ-YafQ complex and the antitoxin DinJ alone. Based on structure-guided and site-directed mutagenesis of DinJ-YafQ, we showed that two pairs of amino acids in DinJ were important for DNA binding: The R8A and K16A, and S31A and R35A substitutions in DinJ abolished the DNA binding ability of the DinJ-YafQ complex. | |||
Structural and Functional Characterization of Escherichia coli Toxin-antitoxin Complex DinJ-YafQ.,Liang Y, Gao Z, Wang F, Zhang Y, Dong Y, Liu Q J Biol Chem. 2014 Jun 12. pii: jbc.M114.559773. PMID:24923448<ref>PMID:24923448</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Dong, Y H.]] | |||
[[Category: Gao, Z Q.]] | |||
[[Category: Liang, Y J.]] | |||
[[Category: Liu, Q S.]] | |||
[[Category: Antitoxin]] | |||
[[Category: Toxin]] | |||
Revision as of 06:21, 25 June 2014
crystal structure of YafQ from E.coli strain BL21(DE3)
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