Role of protein subunits in Proteus rettgeri penicillin G acylase

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Abstract
Penicillin G acylase from Proteus rettgeri is an 80,000- to 90,000-dalton enzyme composed of two nonidentical subunits. Both subunits were required for enzymatic activity. The 65,000-dalton beta subunit contained a phenylmethylsulfonyl fluoride-sensitive residue required for enzymatic activity, and the 24,500-dalton alpha subunit contained the domain that imparts specificity for the penicillin side chain.