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==Crystallographic structures of IlvN.Val/Ile complexes:Conformational selectivity for feedback inhibition of AHASs== | ==Crystallographic structures of IlvN.Val/Ile complexes:Conformational selectivity for feedback inhibition of AHASs== | ||
<StructureSection load='5yum' size='340' side='right' caption='[[5yum]], [[Resolution|resolution]] 2.43Å' scene=''> | <StructureSection load='5yum' size='340' side='right'caption='[[5yum]], [[Resolution|resolution]] 2.43Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5yum]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YUM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5YUM FirstGlance]. <br> | <table><tr><td colspan='2'>[[5yum]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5YUM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5YUM FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=ILE:ISOLEUCINE'>ILE</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=ILE:ISOLEUCINE'>ILE</scene></td></tr> | ||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ilvN, b3670, JW3645 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Acetolactate_synthase Acetolactate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.2.1.6 2.2.1.6] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Acetolactate_synthase Acetolactate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.2.1.6 2.2.1.6] </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=5yum FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yum OCA], [http://pdbe.org/5yum PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5yum RCSB], [http://www.ebi.ac.uk/pdbsum/5yum PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5yum ProSAT]</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=5yum FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5yum OCA], [http://pdbe.org/5yum PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5yum RCSB], [http://www.ebi.ac.uk/pdbsum/5yum PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5yum ProSAT]</span></td></tr> | ||
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<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
Conformational factors that predicate selectivity for valine or isoleucine binding to IlvN leading to the regulation of aceto hydroxy acid synthase I (AHAS I) of Escherichia coli have been determined for the first time from high-resolution (1.9-2.43 A) crystal structures of IlvN.Val and IlvN.Ile complexes. The valine and isoleucine ligand binding pockets are located at the dimer interface. In the IlvN.Ile complex, among residues in the binding pocket, the side chain of Cys(43) is 2-fold disordered (chi1 angles of gauche(-) and trans). Only one conformation can be observed for the identical residue in the IlvN.Val complexes. In a reversal, the side chain of His(53), located at the surface of the protein, exhibits two conformations in the IlvN.Val complex. The concerted conformational switch in the side chains of Cys(43) and His(53) may play an important role in the regulation of the AHAS I holoenzyme activity. A significant result is the establishment of the subunit composition in the AHAS I holoenzyme by analytical ultracentrifugation. Solution nuclear magnetic resonance and analytical ultracentrifugation experiments have also provided important insights into the hydrodynamic properties of IlvN in the ligand-free and -bound states. The structural and biophysical data unequivocally establish the molecular basis for differential binding of the ligands to IlvN and a rationale for the resistance of IlvM to feedback inhibition by the branched-chain amino acids. | |||
Crystallographic Structures of IlvN.Val/Ile Complexes: Conformational Selectivity for Feedback Inhibition of Aceto Hydroxy Acid Synthases.,Bansal A, Karanth NM, Demeler B, Schindelin H, Sarma SP Biochemistry. 2019 Mar 29. doi: 10.1021/acs.biochem.9b00050. PMID:30887800<ref>PMID:30887800</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Acetolactate synthase]] | [[Category: Acetolactate synthase]] | ||
[[Category: Ecoli]] | |||
[[Category: Large Structures]] | |||
[[Category: Bansal, A]] | [[Category: Bansal, A]] | ||
[[Category: Demeler, B]] | [[Category: Demeler, B]] | ||
Revision as of 11:05, 3 April 2019
Crystallographic structures of IlvN.Val/Ile complexes:Conformational selectivity for feedback inhibition of AHASsCrystallographic structures of IlvN.Val/Ile complexes:Conformational selectivity for feedback inhibition of AHASs
Structural highlights
Publication Abstract from PubMedConformational factors that predicate selectivity for valine or isoleucine binding to IlvN leading to the regulation of aceto hydroxy acid synthase I (AHAS I) of Escherichia coli have been determined for the first time from high-resolution (1.9-2.43 A) crystal structures of IlvN.Val and IlvN.Ile complexes. The valine and isoleucine ligand binding pockets are located at the dimer interface. In the IlvN.Ile complex, among residues in the binding pocket, the side chain of Cys(43) is 2-fold disordered (chi1 angles of gauche(-) and trans). Only one conformation can be observed for the identical residue in the IlvN.Val complexes. In a reversal, the side chain of His(53), located at the surface of the protein, exhibits two conformations in the IlvN.Val complex. The concerted conformational switch in the side chains of Cys(43) and His(53) may play an important role in the regulation of the AHAS I holoenzyme activity. A significant result is the establishment of the subunit composition in the AHAS I holoenzyme by analytical ultracentrifugation. Solution nuclear magnetic resonance and analytical ultracentrifugation experiments have also provided important insights into the hydrodynamic properties of IlvN in the ligand-free and -bound states. The structural and biophysical data unequivocally establish the molecular basis for differential binding of the ligands to IlvN and a rationale for the resistance of IlvM to feedback inhibition by the branched-chain amino acids. Crystallographic Structures of IlvN.Val/Ile Complexes: Conformational Selectivity for Feedback Inhibition of Aceto Hydroxy Acid Synthases.,Bansal A, Karanth NM, Demeler B, Schindelin H, Sarma SP Biochemistry. 2019 Mar 29. doi: 10.1021/acs.biochem.9b00050. PMID:30887800[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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