1y6u

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[[Image:1y6u.png|left|200px]]
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==The Structure of the Excisionase (Xis) Protein from Conjugative Transposon Tn916 Provides Insights into the Regulation of Heterobivalent Tyrosine Recombinases==
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<StructureSection load='1y6u' size='340' side='right' caption='[[1y6u]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1y6u]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Enterococcus_faecalis Enterococcus faecalis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Y6U OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1Y6U FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">xis ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1351 Enterococcus faecalis])</td></tr>
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<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=1y6u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1y6u OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1y6u RCSB], [http://www.ebi.ac.uk/pdbsum/1y6u PDBsum]</span></td></tr>
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<table>
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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/y6/1y6u_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/chain_selection.php?pdb_ID=2ata 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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Heterobivalent tyrosine recombinases play a prominent role in numerous bacteriophage and transposon recombination systems. Their enzymatic activities are frequently regulated at a structural level by excisionase factors, which alter the ability of the recombinase to assemble into higher-order recombinogenic nucleoprotein structures. The Tn916 conjugative transposon spreads antibiotic resistance in pathogenic bacteria and is mobilized by a heterobivalent recombinase (Tn916Int), whose activity is regulated by an excisionase factor (Tn916Xis). Unlike the well-characterized (lambda)Xis excisionase from bacteriophage lambda, Tn916Xis stimulates excision in vitro and in Escherichia coli only modestly. To gain insights into this functional difference, we have performed in vitro DNA-binding studies of Tn916Xis and Tn916Int, and we have solved the solution structure of Tn916Xis. We show that the heterobivalent Tn916Int protein is capable of bridging the DR2-type and core-type sites on the left arm of the tranpsoson. Consistent with the notion that Tn916Int is regulated only loosely, we find that Tn916Xis binding does not alter the stability of DR2-Tn916Int-core bridges or the ability of Tn916Int to recognize the arms of the transposon in vitro. Despite a high degree of divergence at the primary sequence level, we show that Tn916Xis and (lambda)Xis adopt related prokaryotic winged-helix structures. However, they differ at their C termini, with Tn916Xis replacing the flexible integrase contacting tail found in (lambda)Xis with a positively charged alpha-helix. This difference provides a structural explanation for why Tn916Xis does not interact cooperatively with its cognate integrase in vitro, and reveals how subtle changes in the winged-helix fold can modulate the functional properties of excisionase factors.
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{{STRUCTURE_1y6u| PDB=1y6u | SCENE= }}
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The structure of the excisionase (Xis) protein from conjugative transposon Tn916 provides insights into the regulation of heterobivalent tyrosine recombinases.,Abbani M, Iwahara M, Clubb RT J Mol Biol. 2005 Mar 18;347(1):11-25. Epub 2005 Jan 19. PMID:15733914<ref>PMID:15733914</ref>
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===The Structure of the Excisionase (Xis) Protein from Conjugative Transposon Tn916 Provides Insights into the Regulation of Heterobivalent Tyrosine Recombinases===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_15733914}}
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== References ==
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<references/>
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==About this Structure==
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__TOC__
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[[1y6u]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Enterococcus_faecalis Enterococcus faecalis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Y6U OCA].
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</StructureSection>
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==Reference==
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<ref group="xtra">PMID:015733914</ref><references group="xtra"/>
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[[Category: Enterococcus faecalis]]
[[Category: Enterococcus faecalis]]
[[Category: Abbani, M.]]
[[Category: Abbani, M.]]

Revision as of 19:02, 29 September 2014

The Structure of the Excisionase (Xis) Protein from Conjugative Transposon Tn916 Provides Insights into the Regulation of Heterobivalent Tyrosine Recombinases

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