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JBC, Vol. 253, Issue 12, 4090-4092, Jun, 1978

A novel magnesium-independent neutral sphingomyelinase associated with rat central nervous system meylin

S. Yamaguchi and K. Suzuki

Purified myelin fractions prepared from young adult rat brain contain a novel sphingomyelinase which has a pH optimum of 7.0 and does not require divalent cations. This sphingomyelinase is different from the two previously known sphingomyelinases in the brain--the acidic sphingomyelinase and the magnesium-dependent neutral sphingomyelinase. When the distributions of the sphingomyelinases among the purified myelin, the total subcellular fractions heavier than myelin (greater than 0.85 M sucrose), and the microsomes were examined, the magnesium-independent sphingomyelinase was detected only in myelin, while the magnesium-dependent sphingomyelinase was present in the other two fractions but not in myelin. Therefore, this new sphingomyelinase appears to be specifically localized in the myelin sheath.
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