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- W1488127556 abstract "Kinetic data for the 6'-aminoglycoside-modifying enzyme, AAC(6')-4, also named kanamycin acetyltransferase, have been collected for six aminoglycoside antibiotics (amikacin, gentamicin C1a, kanamycin A, neomycin B, sisomicin, and tobramycin) and three coenzymes (acetyl-CoA, n-propionyl-CoA, and n-butyryl-CoA). The initial velocity pattern using acetyl-CoA favors a ping-pong kinetic mechanism (Kia = -0.34 +/- 0.34 microM), but the pattern using n-propionyl-CoA supports a sequential one (Kia = 2.7 +/- 0.8 microM). Kinetic analyses using alternative substrates confirm the sequential mechanism and, moreover, clearly identify a random order of addition of antibiotic and coenzyme because V/K values of antibiotics varied 40-fold as the identity of the coenzyme was changed and V/K values of coenzyme varied 13-fold as the identity of the antibiotic was changed. One or both sets of values would have remained unchanged if the mechanism were either ordered sequential or ping-pong. Combining these results with structure-activity data which argue for a rapid rate of release of substrates and products relative to the rate of enzymatic turnover (Radika, K., and Northrop, D. B. (1984) Biochemistry 25, in press) establishes the kinetic mechanism as rapid equilibrium random sequential." @default.
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- W1488127556 date "1984-10-01" @default.
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- W1488127556 title "The kinetic mechanism of kanamycin acetyltransferase derived from the use of alternative antibiotics and coenzymes." @default.
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- W1488127556 doi "https://doi.org/10.1016/s0021-9258(18)90781-7" @default.
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