View source for 2zqb


==Crystal structure of a psychrotrophic RNaseHI variant with sextuple thermostabilizing mutations==
<StructureSection load='2zqb' size='340' side='right'caption='[[2zqb]], [[Resolution|resolution]] 2.49&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2zqb]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Shewanella_oneidensis Shewanella oneidensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ZQB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ZQB 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]] 2.49&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=2zqb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2zqb OCA], [https://pdbe.org/2zqb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2zqb RCSB], [https://www.ebi.ac.uk/pdbsum/2zqb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2zqb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RNH_SHEON RNH_SHEON] Endonuclease that specifically degrades the RNA of RNA-DNA hybrids (By similarity).
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zq/2zqb_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2zqb ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The Arg97 --&gt; Gly and Asp136 --&gt; His mutations stabilized So-RNase HI from the psychrotrophic bacterium Shewanella oneidensis MR-1 by 5.4 and 9.7 degrees C, respectively, in T(m), and 3.5 and 6.1 kJ x mol(-1), respectively, in DeltaG(H2O). These mutations also stabilized the So-RNase HI derivative (4x-RNase HI) with quadruple thermostabilizing mutations in an additive manner. As a result, the resultant sextuple mutant protein (6x-RNase HI) was more stable than the wild-type protein by 28.8 degrees C in T(m) and 27.0 kJ x mol(-1) in DeltaG(H2O). To analyse the effects of the mutations on the protein structure, the crystal structure of the 6x-RNase HI protein was determined at 2.5 A resolution. The main chain fold and interactions of the side-chains of the 6x-RNase HI protein were basically identical to those of the wild-type protein, except for the mutation sites. These results indicate that all six mutations independently affect the protein structure, and are consistent with the fact that the thermostabilizing effects of the mutations are roughly additive. The introduction of favourable interactions and the elimination of unfavourable interactions by the mutations contribute to the stabilization of the 6x-RNase HI protein. We propose that So-RNase HI is destabilized when compared with its mesophilic and thermophilic counterparts in a localized fashion by increasing the number of amino acid residues unfavourable for protein stability.

Destabilization of psychrotrophic RNase HI in a localized fashion as revealed by mutational and X-ray crystallographic analyses.,Rohman MS, Tadokoro T, Angkawidjaja C, Abe Y, Matsumura H, Koga Y, Takano K, Kanaya S FEBS J. 2009 Jan;276(2):603-13. Epub 2008 Dec 12. PMID:19120449<ref>PMID:19120449</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2zqb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ribonuclease 3D structures|Ribonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Shewanella oneidensis]]
[[Category: Angkawidjaja C]]
[[Category: Kanaya S]]