2i5l

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(New page: 200px<br /><applet load="2i5l" size="450" color="white" frame="true" align="right" spinBox="true" caption="2i5l, resolution 2.550&Aring;" /> '''Crystal structure o...)
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[[Image:2i5l.jpg|left|200px]]<br /><applet load="2i5l" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="2i5l, resolution 2.550&Aring;" />
 
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'''Crystal structure of Bacillus subtilis Cold Shock Protein variant Bs-CspB M1R/E3K/K65I'''<br />
 
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==Overview==
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==Crystal structure of Bacillus subtilis Cold Shock Protein variant Bs-CspB M1R/E3K/K65I==
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The bacterial cold shock proteins (Csp) are widely used as models for the, experimental and computational analysis of protein stability. In a, previous study, in vitro evolution was employed to identify strongly, stabilizing mutations in Bs-CspB from Bacillus subtilis. The best variant, found by this approach contained the mutations M1R, E3K and K65I, which, raised the midpoint of thermal unfolding of Bs-CspB from 53.8 degrees C to, 83.7 degrees C, and increased the Gibbs free energy of stabilization by, 20.9 kJ mol(-1). Another selected variant with the two mutations A46K and, S48R was stabilized by 11.1 kJ mol(-1). To elucidate the molecular basis, of these stabilizations, we determined the crystal structures of these two, Bs-CspB variants. The mutated residues are generally well ordered and, provide additional stabilizing interactions, such as charge interactions, additional hydrogen bonds and improved side-chain packing. Several, mutations improve the electrostatic interactions, either by the removal of, unfavorable charges (E3K) or by compensating their destabilizing, interactions (A46K, S48R). The stabilizing mutations are clustered at a, contiguous surface area of Bs-CspB, which apparently is critically, important for the stability of the beta-barrel structure but not well, optimized in the wild-type protein.
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<StructureSection load='2i5l' size='340' side='right'caption='[[2i5l]], [[Resolution|resolution]] 2.55&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[2i5l]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2I5L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2I5L FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.55&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2i5l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i5l OCA], [https://pdbe.org/2i5l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2i5l RCSB], [https://www.ebi.ac.uk/pdbsum/2i5l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2i5l ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CSPB_BACSU CSPB_BACSU] Binds to the pentamer sequences ATTGG and CCAAT with highest affinity in single-stranded DNA, and also to other sequences. Has greater affinity for ATTGG than CCAAT. Can act as transcriptional activator of cold shock genes by recognizing putative ATTGG-box elements present in promoter regions of genes induced under cold shock conditions.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/i5/2i5l_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=2i5l ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The bacterial cold shock proteins (Csp) are widely used as models for the experimental and computational analysis of protein stability. In a previous study, in vitro evolution was employed to identify strongly stabilizing mutations in Bs-CspB from Bacillus subtilis. The best variant found by this approach contained the mutations M1R, E3K and K65I, which raised the midpoint of thermal unfolding of Bs-CspB from 53.8 degrees C to 83.7 degrees C, and increased the Gibbs free energy of stabilization by 20.9 kJ mol(-1). Another selected variant with the two mutations A46K and S48R was stabilized by 11.1 kJ mol(-1). To elucidate the molecular basis of these stabilizations, we determined the crystal structures of these two Bs-CspB variants. The mutated residues are generally well ordered and provide additional stabilizing interactions, such as charge interactions, additional hydrogen bonds and improved side-chain packing. Several mutations improve the electrostatic interactions, either by the removal of unfavorable charges (E3K) or by compensating their destabilizing interactions (A46K, S48R). The stabilizing mutations are clustered at a contiguous surface area of Bs-CspB, which apparently is critically important for the stability of the beta-barrel structure but not well optimized in the wild-type protein.
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==About this Structure==
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Optimized variants of the cold shock protein from in vitro selection: structural basis of their high thermostability.,Max KE, Wunderlich M, Roske Y, Schmid FX, Heinemann U J Mol Biol. 2007 Jun 15;369(4):1087-97. Epub 2007 Apr 12. PMID:17481655<ref>PMID:17481655</ref>
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2I5L is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2I5L OCA].
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==Reference==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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Optimized variants of the cold shock protein from in vitro selection: structural basis of their high thermostability., Max KE, Wunderlich M, Roske Y, Schmid FX, Heinemann U, J Mol Biol. 2007 Jun 15;369(4):1087-97. Epub 2007 Apr 12. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17481655 17481655]
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</div>
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<div class="pdbe-citations 2i5l" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Bacillus subtilis]]
[[Category: Bacillus subtilis]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Heinemann, U.]]
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[[Category: Heinemann U]]
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[[Category: Max, K.E.A.]]
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[[Category: Max KEA]]
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[[Category: beta-barrel]]
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[[Category: cold shock domain]]
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[[Category: dna binding protein]]
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[[Category: expression regulator]]
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[[Category: oligonucleotide/oligosaccharide binding fold]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 12:09:36 2007''
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Current revision

Crystal structure of Bacillus subtilis Cold Shock Protein variant Bs-CspB M1R/E3K/K65I

PDB ID 2i5l

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