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• W2062947568 abstract "The effect of the photoactivated reagent 4,4'-diazidostilbene 2,2'-disulfonic acid (DASS) on rat liver microsomal glucose-6-phosphatase has been investigated in order to analyze the accessibility and the chemical nature of functional sites of the integral enzyme protein. The following results were obtained. (i) When native rat liver microsomes are irradiated with the photoactive reagent, the activity of glucose-6-phosphatase is progressively inhibited. However, complete reactivation is obtained by modification of the DASS-labeled microsomes with Triton X-114. (ii) Inhibition of glucose-6-phosphatase is also reversed when the DASS-labeled microsomes are treated with p-mercuribenzoate or dithiothreitol. (iii) When native microsomes are labeled with DASS an intensely fluorescent adduct is formed whose emission and excitation maximum corresponds with those obtained when cysteine or 3-mercaptopropionic acid are irradiated in the presence of the photolabile reagent. (iv) The data from fluorescence measurements show that p-mercuribenzoate and dithiothreitol reduce fluorescence labeling of the microsomes whereas Triton modification of the DASS-labeled membranes does not affect the DASS-induced fluorescence. (v) Glucose 6-phosphate hydrolysis of the partially purified glucose-6-phosphatase is also inhibited as observed with native microsomes. The DASS-induced inhibition is reversed and prevented by p-mercuribenzoate; however, the partially purified enzyme cannot be reactivated by Triton X-114. (vi) When glucose-6-phosphatase is partially purified from the DASS-labeled microsomes this enzyme preparation is fluorescence labeled and inhibited. From these results we conclude that DASS directly reacts with the integral phosphohydrolase mainly by chemical modification of essential sulfhydryl groups of the enzyme protein accessible from the cytoplasmic surface of the native microsomal membrane. The Triton-induced reactivation of the glucose-6-phosphatase of DASS-labeled microsomes is explained in terms of conformational changes of the integral protein elicited during modification of the surrounding membrane by detergent." @default.
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• W2062947568 date "1989-11-01" @default.
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• W2062947568 title "Topographical localization and characterization of microsomal glucose-6-phosphatase binding sites accessible to 4,4′-diazidostilbene 2,2′-disulfonic acid" @default.
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• W2062947568 doi "https://doi.org/10.1016/0003-9861(89)90365-2" @default.
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