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• W2070138086 abstract "The previously observed differences in properties of human leucocyte and fibroblast cerebroside sulphate sulphatase (cerebroside-3-sulphate 3-sulphohydrolase, EC 3.1.6.8) measured in vitro have been found to be due to subtle differences in incubation conditions. Maximum enzyme activity was observed with either crude sodium taurocholate or with pure sodium taurodeoxycholate. The optimum bile salt concentration of the enzyme in leucocyte or fibroblast extracts, but not the pure ox liver enzyme, was critically dependent on protein concentration. At low concentrations of the latter (less than 0.1 mg/ml), maximum activity was observed at taurocholate concentrations less than 0.5 mg/ml; at protein concentrations greater than 0.20 mg/ml substantially more bile acid (more than 1.3 mg/ml) was required to stimulate maximum activity. Addition of Triton X-100 or bovine serum albumin to the incubation mixtures increased the optimum taurocholate concentration. The dependence of the bile salt optimum on protein concentration appears to be related to the binding of the lipid substrate to membranous protein present in the tissue extracts. Release of the bound lipid is effected either by increasing the bile salt human leucocyte, fibroblast and liver X-100. In the presence of excess bile salt human leucocyte, fibroblast and liver cerebroside sulphate sulphatase activity is stimulated by Triton at low protein concentrations; under identical conditions the pure or crude ox-liver enzyme is substantially inhibited. Our data also show that cerebroside sulphate sulphatase activity measured in extracts from leucocytes and fibroblasts, the tissues normally used to effect a diagnosis of metachromatic leucodystrophy, is the result of a complex interaction of bile salt, protein, Triton X-100 and probably the substrate itself. Any slight alteration in any of those factors, without a corresponding change in any or all of the others, can have a marked effect on the measured enzyme activity, and may lead to errors in the diagnosis of metachromatic leucodystrophy." @default.
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• W2070138086 date "1980-10-01" @default.
• W2070138086 modified "2023-09-23" @default.
• W2070138086 title "The effect of the interdependence of protein and bile salt concentrations on the measurement of cerebroside sulphate sulphatase activity in human leucocyte and fibroblast extracts" @default.
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• W2070138086 doi "https://doi.org/10.1016/0005-2744(80)90504-5" @default.
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