1nki | pdb_00001nki

CRYSTAL STRUCURE OF THE FOSFOMYCIN RESISTANCE PROTEIN A (FOSA) CONTAINING BOUND PHOSPHONOFORMATE

spinqualitylabelsall models 1nki, resolution 0.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1nki is a 2 chain structure with sequence from Pseudomonas aeruginosa pao1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: K, MN, PPF Related: 1lqk, 1lqo, 1lqp Activity: Glutathione transferase, with EC number 2.5.1.18 Resources: FirstGlance, OCA, RCSB, PDBsum 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 PubMed Fosfomycin [(1R,2S)-epoxypropylphosphonic acid] is a simple phosphonate found to have antibacterial activity against both Gram-positive and Gram-negative microorganisms. Early resistance to the clinical use of the antibiotic was linked to a plasmid-encoded resistance protein, FosA, that catalyzes the addition of glutathione to the oxirane ring, rendering the antibiotic inactive. Subsequent studies led to the discovery of a genomically encoded homologue in the pathogen Pseudomonas aeruginosa. The proteins are Mn(II)-dependent enzymes where the metal is proposed to act as a Lewis acid stabilizing the negative charge that develops on the oxirane oxygen in the transition state. Several simple phosphonates, including the antiviral compound phosphonoformate (K(i) = 0.4 +/- 0.1 microM, K(d) approximately 0.2 microM), are shown to be inhibitors of FosA. The crystal structure of FosA from P. aeruginosa with phosphonoformate bound in the active site has been determined at 0.95 A resolution and reveals that the inhibitor forms a five-coordinate complex with the Mn(II) center with a geometry similar to that proposed for the transition state of the reaction. Binding studies show that phosphonoformate has a near-diffusion-controlled on rate (k(on) approximately 10(7)-10(8) M(-1) s(-1)) and an off rate (k(off) = 5 s(-1)) that is slower than that for fosfomycin (k(off) = 30 s(-1)). Taken together, these data suggest that the FosA-catalyzed reaction has a very early transition state and phosphonoformate acts as a minimal transition state analogue inhibitor. Phosphonoformate: a minimal transition state analogue inhibitor of the fosfomycin resistance protein, FosA.,Rigsby RE, Rife CL, Fillgrove KL, Newcomer ME, Armstrong RN Biochemistry. 2004 Nov 2;43(43):13666-73. PMID:15504029 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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