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Ceramide lactoside [1-O-(galactosido-4-beta-glucosido)-2-N-acyl-sphingosine] was hydrolysed to ceramide glucoside and galactose by beta-galactosidase of rat brain. The reaction was not reversible, required cholate or taurocholate, had optimum pH5.0 and K(m) 2.2x10(-5)m. It was inhibited by gamma-galactonolactone and galactose as well as by ceramide, sphingosine and fatty acid. Ceramide lactoside could be degraded to ceramide, galactose and glucose by mixtures of rat-brain beta-galactosidase and ox-brain beta-glucosidase.
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G Shimon (1966) studied this question.
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