1htq: Difference between revisions
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==Multicopy crystallographic structure of a relaxed glutamine synthetase from Mycobacterium tuberculosis== | ==Multicopy crystallographic structure of a relaxed glutamine synthetase from Mycobacterium tuberculosis== | ||
<StructureSection load='1htq' size='340' side='right' caption='[[1htq]], [[Resolution|resolution]] 2.40Å' scene=''> | <StructureSection load='1htq' size='340' side='right' caption='[[1htq]], [[Resolution|resolution]] 2.40Å' scene=''> | ||
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1hto|1hto]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1hto|1hto]]</td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glutamate--ammonia_ligase Glutamate--ammonia ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.1.2 6.3.1.2] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Glutamate--ammonia_ligase Glutamate--ammonia ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.1.2 6.3.1.2] </span></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=1htq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1htq OCA], [http://pdbe.org/1htq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1htq RCSB], [http://www.ebi.ac.uk/pdbsum/1htq PDBsum]</span></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=1htq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1htq OCA], [http://pdbe.org/1htq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1htq RCSB], [http://www.ebi.ac.uk/pdbsum/1htq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1htq ProSAT]</span></td></tr> | ||
</table> | </table> | ||
{{Large structure}} | {{Large structure}} | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ht/1htq_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ht/1htq_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
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</div> | </div> | ||
<div class="pdbe-citations 1htq" style="background-color:#fffaf0;"></div> | <div class="pdbe-citations 1htq" style="background-color:#fffaf0;"></div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 12:02, 10 January 2018
Multicopy crystallographic structure of a relaxed glutamine synthetase from Mycobacterium tuberculosisMulticopy crystallographic structure of a relaxed glutamine synthetase from Mycobacterium tuberculosis
Structural highlights
Warning: this is a large structure, and loading might take a long time or not happen at all. 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 crystal structure of glutamine synthetase (GS) from Mycobacterium tuberculosis determined at 2.4 A resolution reveals citrate and AMP bound in the active site. The structure was refined with strict 24-fold noncrystallographic symmetry (NCS) constraints and has an R-factor of 22.7% and an R-free of 25.5%. Multicopy refinement using 10 atomic models and strict 24-fold NCS constraints further reduced the R-factor to 20.4% and the R-free to 23.2%. The multicopy model demonstrates the range of atomic displacements of catalytic and regulatory loops in glutamine synthesis, simulating loop motions. A comparison with loop positions in substrate complexes of GS from Salmonella typhimurium shows that the Asp50 and Glu327 loops close over the active site during catalysis. These loop closures are preceded by a conformational change of the Glu209 beta-strand upon metal ion or ATP binding that converts the enzyme from a relaxed to a taut state. We propose a model of the GS regulatory mechanism based on the loop motions in which adenylylation of the Tyr397 loop reverses the effect of metal ion binding, and regulates intermediate formation by preventing closure of the Glu327 loop. Multicopy crystallographic refinement of a relaxed glutamine synthetase from Mycobacterium tuberculosis highlights flexible loops in the enzymatic mechanism and its regulation.,Gill HS, Pfluegl GM, Eisenberg D Biochemistry. 2002 Aug 6;41(31):9863-72. PMID:12146952[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References |
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