The primary structure of the identical subunits of crystalline Δ5-3-ketosteroid isomerase (EC 5.3.3.1) of Pseudomonas testosteroni has been determined by standard procedures to be the following: [see PDF for sequence] Thus, each subunit consists of a single polypeptide chain of 125 amino acid residues. The subunit molecular weight, calculated from the amino acid sequence, is 13,394 or 33% of the ultracentrifugally determined molecular weight of the intact isomerase.
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Benson et al. (1971) studied this question.
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