Phosphoenolpyruvate carboxylase (PEPC) from maize leaves has an M r of 400000. The native enzyme molecule is a homotetramer. The amino acid composition of PEPC is determined. The enzyme contains 8 half‐cystine residues per subunit. The role of half‐cystine residues and the steric arrangement of the enzyme protein molecule are discussed.
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Stiborová et al. (1986) studied this question.
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