4chg: Difference between revisions

Line 7:

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4chg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4chg OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4chg RCSB], [http://www.ebi.ac.uk/pdbsum/4chg PDBsum]</span></td></tr>

</table>

== Publication Abstract from PubMed ==

Although PIN (PilT N-terminal)-domain proteins are known to have ribonuclease activity, their specific mechanism of action remains unknown. VapCs form a family of ribonucleases that possess a PIN-domain assembly and are known as toxins. The activities of VapCs are impaired by VapB antitoxins. Here we present the crystal structure of the VapBC-15 toxin-antitoxin complex from Mycobacterium tuberculosis determined to 2.1A resolution. The VapB-15 and VapC-15 components assemble into one heterotetramer (VapB2C2) and two heterotrimers (VapBC2) in each asymmetric unit of the crystal. The active site of VapC-15 toxin consists of a cluster of acidic amino acid residues and two divalent metal ions, forming a well organised ribonuclease active site. The distribution of the catalytic-site residues of the VapC-15 toxin is similar to that of T4 RNase H and of Methanococcus jannaschii FEN-1, providing strong evidence that these three proteins share a similar mechanism of activity. The presence of both VapB2C2 and VapBC2 emphasizes the fact that the same antitoxin can bind the toxin in 1:1 and 1:2 ratios. The crystal structure determination of the VapBC-15 complex reveals for the first time a PIN-domain ribonuclease protein that shows two metal ions at the active site and a variable mode of toxin-antitoxin assembly. The structure further shows that VapB-15 antitoxin binds to the same groove meant for the binding of putative substrate (RNA), resulting in the inhibition of VapC-15's toxicity.

Crystal structure of the VapBC-15 complex from Mycobacterium tuberculosis reveals a two-metal ion dependent PIN-domain ribonuclease and a variable mode of toxin-antitoxin assembly.,Das U, Pogenberg V, Subhramanyam UK, Wilmanns M, Gourinath S, Srinivasan A J Struct Biol. 2014 Oct 22;188(3):249-258. doi: 10.1016/j.jsb.2014.10.002. PMID:25450593<ref>PMID:25450593</ref>

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>

</div>

== References ==

__TOC__

</StructureSection>

Navigation menu

Page actions

Page actions

Personal tools

Navigation

Search

Tools

@@ Line 7: / Line 7: @@
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4chg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4chg OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4chg RCSB], [http://www.ebi.ac.uk/pdbsum/4chg PDBsum]</span></td></tr>
 </table>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Although PIN (PilT N-terminal)-domain proteins are known to have ribonuclease activity, their specific mechanism of action remains unknown. VapCs form a family of ribonucleases that possess a PIN-domain assembly and are known as toxins. The activities of VapCs are impaired by VapB antitoxins. Here we present the crystal structure of the VapBC-15 toxin-antitoxin complex from Mycobacterium tuberculosis determined to 2.1A resolution. The VapB-15 and VapC-15 components assemble into one heterotetramer (VapB2C2) and two heterotrimers (VapBC2) in each asymmetric unit of the crystal. The active site of VapC-15 toxin consists of a cluster of acidic amino acid residues and two divalent metal ions, forming a well organised ribonuclease active site. The distribution of the catalytic-site residues of the VapC-15 toxin is similar to that of T4 RNase H and of Methanococcus jannaschii FEN-1, providing strong evidence that these three proteins share a similar mechanism of activity. The presence of both VapB2C2 and VapBC2 emphasizes the fact that the same antitoxin can bind the toxin in 1:1 and 1:2 ratios. The crystal structure determination of the VapBC-15 complex reveals for the first time a PIN-domain ribonuclease protein that shows two metal ions at the active site and a variable mode of toxin-antitoxin assembly. The structure further shows that VapB-15 antitoxin binds to the same groove meant for the binding of putative substrate (RNA), resulting in the inhibition of VapC-15's toxicity.
+Crystal structure of the VapBC-15 complex from Mycobacterium tuberculosis reveals a two-metal ion dependent PIN-domain ribonuclease and a variable mode of toxin-antitoxin assembly.,Das U, Pogenberg V, Subhramanyam UK, Wilmanns M, Gourinath S, Srinivasan A J Struct Biol. 2014 Oct 22;188(3):249-258. doi: 10.1016/j.jsb.2014.10.002. PMID:25450593<ref>PMID:25450593</ref>
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
+== References ==
+<references/>
 __TOC__
 </StructureSection>