2vb7: Difference between revisions
New page: left|200px<br /><applet load="2vb7" size="350" color="white" frame="true" align="right" spinBox="true" caption="2vb7, resolution 1.60Å" /> '''BETA-KETOACYL-ACP SY... |
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==Overview== | ==Overview== | ||
Fatty-acid synthesis in bacteria is of great interest as a target for the | Fatty-acid synthesis in bacteria is of great interest as a target for the discovery of antibacterial compounds. The addition of a new acetyl moiety to the growing fatty-acid chain, an essential step in this process, is catalyzed by beta-ketoacyl-ACP synthase (KAS). It is inhibited by natural antibiotics such as cerulenin and thiolactomycin; however, these lack the requirements for optimal drug development. Structure-based biophysical screening revealed a novel synthetic small molecule, 2-phenylamino-4-methyl-5-acetylthiazole, that binds to Escherichia coli KAS I with a binding constant of 25 microM as determined by fluorescence titration. A 1.35 A crystal structure of its complex with its target reveals noncovalent interactions with the active-site Cys163 and hydrophobic residues of the fatty-acid binding pocket. The active site is accessible through an open conformation of the Phe392 side chain and no conformational changes are induced at the active site upon ligand binding. This represents a novel binding mode that differs from thiolactomycin or cerulenin interaction. The structural information on the protein-ligand interaction offers strategies for further optimization of this low-molecular-weight compound. | ||
==About this Structure== | ==About this Structure== | ||
2VB7 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Beta-ketoacyl-acyl-carrier-protein_synthase_I Beta-ketoacyl-acyl-carrier-protein synthase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.41 2.3.1.41] Known structural/functional Site: <scene name='pdbsite=AC1:Csw Binding Site For Chain C'>AC1</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VB7 OCA]. | 2VB7 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Beta-ketoacyl-acyl-carrier-protein_synthase_I Beta-ketoacyl-acyl-carrier-protein synthase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.41 2.3.1.41] Known structural/functional Site: <scene name='pdbsite=AC1:Csw+Binding+Site+For+Chain+C'>AC1</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VB7 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:54:47 2008'' | ||
Revision as of 19:54, 21 February 2008
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BETA-KETOACYL-ACP SYNTHASE I (KAS) FROM E. COLI, APO STRUCTURE AFTER SOAK IN PEG SOLUTION
OverviewOverview
Fatty-acid synthesis in bacteria is of great interest as a target for the discovery of antibacterial compounds. The addition of a new acetyl moiety to the growing fatty-acid chain, an essential step in this process, is catalyzed by beta-ketoacyl-ACP synthase (KAS). It is inhibited by natural antibiotics such as cerulenin and thiolactomycin; however, these lack the requirements for optimal drug development. Structure-based biophysical screening revealed a novel synthetic small molecule, 2-phenylamino-4-methyl-5-acetylthiazole, that binds to Escherichia coli KAS I with a binding constant of 25 microM as determined by fluorescence titration. A 1.35 A crystal structure of its complex with its target reveals noncovalent interactions with the active-site Cys163 and hydrophobic residues of the fatty-acid binding pocket. The active site is accessible through an open conformation of the Phe392 side chain and no conformational changes are induced at the active site upon ligand binding. This represents a novel binding mode that differs from thiolactomycin or cerulenin interaction. The structural information on the protein-ligand interaction offers strategies for further optimization of this low-molecular-weight compound.
About this StructureAbout this Structure
2VB7 is a Single protein structure of sequence from Escherichia coli. Active as Beta-ketoacyl-acyl-carrier-protein synthase I, with EC number 2.3.1.41 Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
Structure-assisted discovery of an aminothiazole derivative as a lead molecule for inhibition of bacterial fatty-acid synthesis., Pappenberger G, Schulz-Gasch T, Kusznir E, Muller F, Hennig M, Acta Crystallogr D Biol Crystallogr. 2007 Dec;63(Pt 12):1208-16. Epub 2007, Nov 16. PMID:18084068
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