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Lactate dehydrogenase from Streptococcus cremoris US3, which has a molecular weight in solution of 140000, was found by dodecylsulphate‐gel electrophoresis to have a minimum molecular weight of 37000. It is, therefore, a tetramer. Approximately 40 tryptic peptides were obtained by fingerprinting and in conjunction with the amino acid composition this indicates that the subunits are similar and probably identical. There is one thiol group per subunit. p ‐Chloromercuribenzoate inhibits the enzyme.
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Dynon et al. (1972) studied this question.
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