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- W2021544520 abstract "The properties of a cholinesterase from mucosal cells of rat intestine have been characterized. The enzyme was identified as butyrylcholinesterase because it was more sensitive to iso-OMPA (IC50 = 1.0 x 10(-6) M) than to BW284C51 (IC50 = 5.5 x 10(-5) M) and was not inhibited by substrate excess. It displayed a higher affinity for acetylthiocholine than for butyrylthiocholine. A major molecular form was observed sedimenting at 5.9 S. Two other minor molecular forms were identified as a hydrophilic tetramer (G4, sedimenting at 10.5 S) and a monomer (G1, sedimenting at 4.3 S). The 5.9 S component was referred to as G form (G for globular) and not G2 as usual dimers for the following reasons: (i) the G form was unaffected by the reducing agents, beta-mercaptoethanol and dithiothreitol, which converted disulfide-linked dimers of acetylcholinesterase into monomers, (ii) the G form was shifted from 5.9 to 3.4 S when the sucrose gradient contained Triton X-100. This value of 3.4 S (in Triton X-100) appeared too low for a typical G2 form. The shift in the S value was partly reversible: the 3.4 S form resedimented at 5.2 S in the absence of detergent. The behavior of the G form in sucrose gradients indicated that it was amphiphilic. This was confirmed in nondenaturing electrophoreses and also by quantitative binding of the G form to octyl-Sepharose. The hydrophobic domain of the G form was not a glycolipid, as shown by its insensitivity to Bacillus thuringiensis phosphatidylinositol-specific phospholipase C and its nonaggregating properties in the absence of nondenaturing detergent.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2021544520 date "1992-11-01" @default.
- W2021544520 modified "2023-09-27" @default.
- W2021544520 title "Amphiphilic forms of butyrylcholinesterase in mucosal cells of rat intestine" @default.
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- W2021544520 doi "https://doi.org/10.1021/bi00159a033" @default.
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