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- W2044219955 abstract "We have examined in detail the substrate specificity of a rabbit kidney fatty acid omega-hydroxylase, designated cytochrome P-450ka2 (CYP4A7). The hydroxylation products were identified as omega- and (omega - 1)-hydroxy fatty acids mainly using gas chromatography-electron impact mass spectrometry. [1] Straight-chain saturated fatty acids ranging from 10 to 19 carbons were effectively hydroxylated at the omega- and (omega - 1)-position. The ratios of omega- to (omega - 1)-hydroxylation activity decreased with increasing the carbon chain length of fatty acids. [2] Both isomyristate and anteisomyristate, and isopalmitate were hydroxylated several fold more rapidly than myristate and palmitate, respectively, with iso-branched chain fatty acids being hydroxylated at the omega-position solely. [3] Both palmitoleate and palmitoelaidate, and both oleate and elaidate were hydroxylated much more rapidly than palmitate and stearate, respectively. [4] Linoleate, gamma-linolenate, and arachidonate were also excellent substrates for this enzyme. [5] Prostaglandin (PG) A1 and PGA2 were efficiently hydroxylated at the omega-position solely, with PGE1 and PGE2 being much less active. [6] Arachidonic acid not only showed a Km value significantly lower than those for lauric acid, gamma-linolenic acid and PGA1, but also it is a potent competitor for lauric acid and PGA1, showing a very high affinity for the enzyme. It is possible that arachidonic acid is the physiological substrate for kidney P-450ka2." @default.
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- W2044219955 date "1993-05-20" @default.
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- W2044219955 title "Catalytic properties of rabbit kidney fatty acid omega-hydroxylase cytochrome P-450ka2 (CYP4A7)." @default.
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