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Partially purified beta-galactosidase of Xanthomonas campestris required 32 to 37 degrees C and pH 5.5 to 5.8 for optimum activity. The enzyme had low affinity for lactose hydrolysis (K(m) = 22 mM) and was inhibited by thiol group reagents, ethylenediaminetetraacetic acid, galactose, and d-galactal.
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Frank et al. (1979) studied this question.