3lgh: Difference between revisions
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==Crystal structure of NikR from Helicobacter pylori with variable Ni site coordination== | |||
=== | <StructureSection load='3lgh' size='340' side='right' caption='[[3lgh]], [[Resolution|resolution]] 2.37Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3lgh]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Helicobacter_pylori Helicobacter pylori]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3LGH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3LGH FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene></td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">HP_1338, NikR ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=210 Helicobacter pylori])</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3lgh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3lgh OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3lgh RCSB], [http://www.ebi.ac.uk/pdbsum/3lgh PDBsum]</span></td></tr> | |||
</table> | |||
== 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/lg/3lgh_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/chain_selection.php?pdb_ID=2ata ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The metalloregulatory protein NikR from Helicobacter pylori (HpNikR) is a master regulator of gene expression which both activates and represses specific genes in response to nickel availability. Here, we report the first crystal structure (at 2.37 A resolution) of Ni(II)HpNikR prepared directly from the holo protein. The protein contains four nickel ions located in two distinct coordination environments. Two nickel ions are bound to sites in a four-coordinate square-planar geometry as predicted on the basis of the structures of NikR from Escherichia coli and Pyrococcus horikoshii . The remaining two nickel ions are bound to sites with unexpected 5- or 6-coordination geometries which were previously thought to be involved in nickel incorporation into the protein. The nickel with 5-/6-coordination geometry utilizes three histidines from two separate monomeric HpNikR units along with two or three water molecules as ligands. The spatial location of the nickel in the 5-/6-coordinate site is within approximately 5 A of the expected site if a 4-coordinate square-planar geometry occurred. Two of the histidines that participate as ligands in the 5-/6-coordinate site would also participate as ligands if the 4-coordinate site was occupied, making it impossible for both sites to be occupied simultaneously. DFT calculations show that the 5-/6-coordinate geometries are energetically favorable when the local protein environment is included in the calculations. The presence of two distinct coordination environments in HpNikR is suggested to be related to the specificity and binding affinity of this transcription factor for DNA. | |||
Holo-Ni(II)HpNikR is an asymmetric tetramer containing two different nickel-binding sites.,West AL, St John F, Lopes PE, MacKerell AD Jr, Pozharski E, Michel SL J Am Chem Soc. 2010 Oct 20;132(41):14447-56. PMID:20863122<ref>PMID:20863122</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Helicobacter pylori]] | [[Category: Helicobacter pylori]] | ||
[[Category: John, F St | [[Category: John, F St]] | ||
[[Category: Pozharski, E | [[Category: Pozharski, E]] | ||
[[Category: Dna-binding]] | [[Category: Dna-binding]] | ||
[[Category: Metal binding protein]] | [[Category: Metal binding protein]] | ||
[[Category: Metal-binding]] | [[Category: Metal-binding]] | ||
Revision as of 19:03, 18 December 2014
Crystal structure of NikR from Helicobacter pylori with variable Ni site coordinationCrystal structure of NikR from Helicobacter pylori with variable Ni site coordination
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe metalloregulatory protein NikR from Helicobacter pylori (HpNikR) is a master regulator of gene expression which both activates and represses specific genes in response to nickel availability. Here, we report the first crystal structure (at 2.37 A resolution) of Ni(II)HpNikR prepared directly from the holo protein. The protein contains four nickel ions located in two distinct coordination environments. Two nickel ions are bound to sites in a four-coordinate square-planar geometry as predicted on the basis of the structures of NikR from Escherichia coli and Pyrococcus horikoshii . The remaining two nickel ions are bound to sites with unexpected 5- or 6-coordination geometries which were previously thought to be involved in nickel incorporation into the protein. The nickel with 5-/6-coordination geometry utilizes three histidines from two separate monomeric HpNikR units along with two or three water molecules as ligands. The spatial location of the nickel in the 5-/6-coordinate site is within approximately 5 A of the expected site if a 4-coordinate square-planar geometry occurred. Two of the histidines that participate as ligands in the 5-/6-coordinate site would also participate as ligands if the 4-coordinate site was occupied, making it impossible for both sites to be occupied simultaneously. DFT calculations show that the 5-/6-coordinate geometries are energetically favorable when the local protein environment is included in the calculations. The presence of two distinct coordination environments in HpNikR is suggested to be related to the specificity and binding affinity of this transcription factor for DNA. Holo-Ni(II)HpNikR is an asymmetric tetramer containing two different nickel-binding sites.,West AL, St John F, Lopes PE, MacKerell AD Jr, Pozharski E, Michel SL J Am Chem Soc. 2010 Oct 20;132(41):14447-56. PMID:20863122[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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