1nnr

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1nnr, resolution 2.25Å ()
Ligands: ,
Gene: PA1129 (Pseudomonas aeruginosa PAO1)
Activity: Glutathione transferase, with EC number 2.5.1.18
Related: 1nki, 1lqk, 1lqo, 1lqp
Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml



Crystal structure of a probable fosfomycin resistance protein (PA1129) from Pseudomonas aeruginosa with sulfate present in the active site

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.

About this Structure

1nnr is a 2 chain structure with sequence from Pseudomonas aeruginosa pao1. Full crystallographic information is available from OCA.

Reference

  • Rigsby RE, Rife CL, Fillgrove KL, Newcomer ME, Armstrong RN. Phosphonoformate: a minimal transition state analogue inhibitor of the fosfomycin resistance protein, FosA. Biochemistry. 2004 Nov 2;43(43):13666-73. PMID:15504029 doi:10.1021/bi048767h

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