Kinetic and Structural Analysis of Bisubstrate Inhibition of the Salmonella enterica Aminoglycoside 6'-N-Acetyltransferase(,).

Kinetic and Structural Analysis of Bisubstrate Inhibition of the Salmonella enterica Aminoglycoside 6'-N-Acetyltransferase(,). Research Abstract Details 

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Kinetic and Structural Analysis of Bisubstrate Inhibition of the Salmonella enterica Aminoglycoside 6'-N-Acetyltransferase(,). Abstract Text:

Maria L B ,Matthew W Vetting,Feng Gao,Lee Freiburger,Karine Auclair,John S Blanchard,Maria L B Magalhães,Matthew W Vetting,Feng Gao,Lee Freiburger,Karine Auclair,John S Blanchard,

Aminoglycosides are antibacterial compounds that act by binding to the A site of the small 30S bacterial ribosomal subunit and inhibiting protein translation. Clinical resistance to aminoglycosides is generally the result of the expression of enzymes that covalently modify the antibiotic, including phosphorylation, adenylylation, and acetylation. Bisubstrate analogs for the aminoglycoside N-acetyltransferases are nanomolar inhibitors of Enterococcus faecium AAC(6')-Ii. However, in the case of the Salmonella enterica aac(6')-Iy-encoded aminoglycoside N-acetyltransferase, we demonstrate that a series of bisubstrate analogs are only micromolar inhibitors. In contrast to studies with AAC(6')-Ii, the inhibition constants toward AAC(6')-Iy are essentially independent of both the identity of the aminoglycoside component of the bisubstrate and the number of carbon atoms that are used to link the CoA and aminoglycoside components. The patterns of inhibition suggest that the CoA portion of the bisubstrate analog can bind to the enzyme-aminoglycoside substrate complex and that the aminoglycoside portion can bind to the enzyme-CoA product complex. However, at the high concentrations of bisubstrate analog used in crystallization experiments, we could crystallize and solve the three-dimensional structure of the enzyme-bisubstrate complex. The structure reveals that both the CoA and aminoglycoside portions bind in essentially the same positions as those previously observed for the enzyme-CoA-ribostamycin complex, with only a modest adjustment to accommodate the "linker". These results are compared to previous studies of the interaction of similar bisubstrate analogs with other aminoglycoside N-acetyltransferases.

Kinetic and Structural Analysis of Bisubstrate Inhibition of the Salmonella enterica Aminoglycoside 6'-N-Acetyltransferase(,). Publishing Authors By Initials

ML ,MW Vetting,F Gao,L Freiburger,K Auclair,JS Blanchard,ML Magalhães,MW Vetting,F Gao,L Freiburger,K Auclair,JS Blanchard,

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Kinetic and Structural Analysis of Bisubstrate Inhibition of the Salmonella enterica Aminoglycoside 6'-N-Acetyltransferase(,). Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Biochemistry

VOLUME: 47

Page Numbers: 579-84

Journal Abbreviation: Biochemistry

ISSN: 0006-2960

DAY: 21

MONTH: 12

YEAR: 2007

Kinetic and Structural Analysis of Bisubstrate Inhibition of the Salmonella enterica Aminoglycoside 6'-N-Acetyltransferase(,). Information

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LANGUAGE: eng

NlmUniqueID: 370623

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AFFILIATION: Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, New York 10461, and Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A2K6.

Country: United States

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MEDLINETA: Biochemistry

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