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In vitro inhibition of Ca+2 ATPase by methylparathion in prawn: a kinetic approach

Reddy, M.S.; Rao, K.V.

Biochemistry International 22(6): 1053-1058

1990

ISSN/ISBN: 0158-5231
PMID: 2151019
Document Number: 348571
The effects of the in vitro addition of an IC50 concentration of methylparathion [parathion-methyl] on Ca2+ ATPase in the nervous and hepatopancreatic tissues of Metapenaeus monoceros were studied. The inhibitory pattern of Ca2+ ATPase elucidated the interaction of methylparathion with an ATPase system. A significant decrease in maximal velocity (Vmax) without appreciable change in apparent Michaelis-Menten constant (Km) suggests that the impact of methylparathion on Ca2+ ATPase is independent of substrate and is of the classical non-competitive type.

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