2kjc: Difference between revisions
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==Solution structure of CzrA in the Zn(II) state== | ==Solution structure of CzrA in the Zn(II) state== | ||
<StructureSection load='2kjc' size='340' side='right'caption='[[2kjc | <StructureSection load='2kjc' size='340' side='right'caption='[[2kjc]]' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2kjc]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[2kjc]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2KJC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2KJC FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=2kjc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2kjc OCA], [https://pdbe.org/2kjc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2kjc RCSB], [https://www.ebi.ac.uk/pdbsum/2kjc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2kjc ProSAT]</span></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=2kjc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2kjc OCA], [https://pdbe.org/2kjc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2kjc RCSB], [https://www.ebi.ac.uk/pdbsum/2kjc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2kjc ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/O85142_STAAU O85142_STAAU] | |||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: | [[Category: Staphylococcus aureus]] | ||
[[Category: | [[Category: Arunkumar AI]] | ||
[[Category: | [[Category: Campanello GC]] | ||
[[Category: | [[Category: Giedroc DP]] | ||
Latest revision as of 12:39, 22 May 2024
Solution structure of CzrA in the Zn(II) stateSolution structure of CzrA in the Zn(II) state
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedStaphylococcus aureus CzrA is a zinc-dependent transcriptional repressor from the ubiquitous ArsR family of metal sensor proteins. Zn(II) binds to a pair of intersubunit C-terminal alpha5-sensing sites, some 15 A distant from the DNA-binding interface, and allosterically inhibits DNA binding. This regulation is characterized by a large allosteric coupling free energy (DeltaGc) of approximately +6 kcal mol(-1), the molecular origin of which is poorly understood. Here, we report the solution quaternary structure of homodimeric CzrA bound to a palindromic 28-bp czr operator, a structure that provides an opportunity to compare the two allosteric "end" states of an ArsR family sensor. Zn(II) binding drives a quaternary structural switch from a "closed" DNA-binding state to a low affinity "open" conformation as a result of a dramatic change in the relative orientations of the winged helical DNA binding domains within the dimer. Zn(II) binding also effectively quenches both rapid and intermediate timescale internal motions of apo-CzrA while stabilizing the native state ensemble. In contrast, DNA binding significantly enhances protein motions in the allosteric sites and reduces the stability of the alpha5 helices as measured by H-D solvent exchange. This study reveals how changes in the global structure and dynamics drive a long-range allosteric response in a large subfamily of bacterial metal sensor proteins, and provides insights on how other structural classes of ArsR sensor proteins may be regulated by metal binding. Solution structure of a paradigm ArsR family zinc sensor in the DNA-bound state.,Arunkumar AI, Campanello GC, Giedroc DP Proc Natl Acad Sci U S A. 2009 Oct 27;106(43):18177-82. Epub 2009 Oct 12. PMID:19822742[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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