View source for 2zrh


==MsRecA Q196A form IV==
<StructureSection load='2zrh' size='340' side='right'caption='[[2zrh]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2zrh]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycolicibacterium_smegmatis_MC2_155 Mycolicibacterium smegmatis MC2 155]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ZRH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ZRH 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]] 3.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=2zrh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2zrh OCA], [https://pdbe.org/2zrh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2zrh RCSB], [https://www.ebi.ac.uk/pdbsum/2zrh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2zrh ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RECA_MYCS2 RECA_MYCS2] Required for homologous recombination (HR) and the bypass of mutagenic DNA lesions (double strand breaks, DSB) by the SOS response. Can catalyze the hydrolysis of ATP in the presence of single-stranded DNA, the ATP-dependent uptake of single-stranded DNA by duplex DNA, and the ATP-dependent hybridization of homologous single-stranded DNAs. Numerous X-ray crystals have been resolved under different conditions which indicate the flexibility of the protein, essential to its function. Gln-196 contributes to this plasticity by acting as a switch residue, which transmits the effect of nucleotide binding to the DNA-binding region.<ref>PMID:17360246</ref> <ref>PMID:17496093</ref> <ref>PMID:21219454</ref> 
== 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/zr/2zrh_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=2zrh ConSurf].
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== Publication Abstract from PubMed ==
The crystal structures of mutants of Mycobacterium smegmatis RecA (MsRecA) involving changes of Gln196 from glutamine to alanine, asparagine and glutamic acid, wild-type MsRecA and several of their nucleotide complexes have been determined using mostly low-temperature and partly room-temperature X-ray data. At both temperatures, nucleotide binding results in a movement of Gln196 towards the bound nucleotide in the wild-type protein. This movement is abolished in the mutants, thus establishing the structural basis for the triggering action of the residue in terms of the size, shape and the chemical nature of the side chain. The 19 crystal structures reported here, together with 11 previously reported MsRecA structures, provide further elaboration of the relation between the pitch of the ;inactive' RecA filament, the orientation of the C-terminal domain with respect to the main domain and the location of the switch residue. The low-temperature structures define one extreme of the range of positions the C-terminal domain can occupy. The movement of the C-terminal domain is correlated with those of the LexA-binding loop and the loop that connects the main and the N-terminal domains. These elements of molecular plasticity are made use of in the transition to the ;active' filament, as evidenced by the recently reported structures of RecA-DNA complexes. The available structures of RecA resulting from X-ray and electron-microscopic studies appear to represent different stages in the trajectory of the allosteric transformations of the RecA filament. The work reported here contributes to the description of the early stages of this trajectory and provides insight into structures relevant to the later stages.

Functionally important movements in RecA molecules and filaments: studies involving mutation and environmental changes.,Prabu JR, Manjunath GP, Chandra NR, Muniyappa K, Vijayan M Acta Crystallogr D Biol Crystallogr. 2008 Nov;64(Pt 11):1146-57. Epub 2008, Oct 18. PMID:19020353<ref>PMID:19020353</ref>

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

==See Also==
*[[3D structures of recombinase A|3D structures of recombinase A]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycolicibacterium smegmatis MC2 155]]
[[Category: Chandra NR]]
[[Category: Manjunath GP]]
[[Category: Muniyappa K]]
[[Category: Prabu JR]]
[[Category: Vijayan M]]