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| {{STRUCTURE_2vba| PDB=2vba | SCENE= }} | | {{STRUCTURE_2vba| PDB=2vba | SCENE= }} |
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| '''BETA-KETOACYL-ACP SYNTHASE I (KAS) FROM E. COLI WITH BOUND AMINO-THIAZOLE INHIBITOR'''
| | ===BETA-KETOACYL-ACP SYNTHASE I (KAS) FROM E. COLI WITH BOUND AMINO-THIAZOLE INHIBITOR=== |
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| ==Overview==
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| 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.
| | The line below this paragraph, {{ABSTRACT_PUBMED_18084068}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 18084068 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_18084068}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Lipid synthesis]] | | [[Category: Lipid synthesis]] |
| [[Category: Transferase]] | | [[Category: Transferase]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 18:32:38 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:29:49 2008'' |
