Structure and function of mutant Arg44Lys of 4-hydroxybenzoate hydroxylase implications for NADPH binding.

Abstract

Arg44, located at the si-face side of the flavin ring in 4-hydroxybenzoate hydroxylase, was changed to lysine by site-specific mutagenesis. Crystals of [R44K]4-hydroxybenzoate hydroxylase complexed with 4-hydroxybenzoate diffract to 0.22-nm resolution. The structure of [R44K]4-hydroxybenzoate hydroxylase is identical to the wild-type enzyme except for local… (More)

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