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The principal autolytic enzyme activity of the cell sap of Staphylococcus aureus H has been purified 400-fold. It is an N-acetylmuramyl-l-alanine amidase. This enzyme has a molecular weight of 8 to 10 x 10(5), a pH optimum of 7.3, an ionic strength optimum of 0.16 m and a K(m) of 10(-3)m murein repeating units.
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Singer et al. (1972) studied this question.
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