Abstract
Aminoimidazole ribonucleotide (AIR) synthetase has been purified 15-fold to apparent homogeneity from Escherichia coli which contains a multicopy plasmid containing the purM, AIR synthetase, gene. The protein is a dimer composed of two identical subunits of Mr 38,500. The N-terminal sequence, amino acid composition, and steady-state kinetics of the protein have been determined. AIR synthetase has been shown to catalyze the transfer of the formyl oxygen of [18O]formylglycinamide ribonucleotide to Pi.
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