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• W1553971732 abstract "Abstract Peptide maps of Form A and Form B of porcine submaxillary gland beta Gal alpha 2----3 sialyltransferase were essentially identical, consistent with the view that the two forms are not different enzyme species but that one, the B form (Mr = 44,000) is derived from the A form (Mr = 49,000). Analysis of the sialyltransferase activity in subcellular fractions from homogenates of porcine submaxillary glands reveals that 85% of the total activity of the transferase is bound to membranes, mostly in the Golgi apparatus, and that the remainder is soluble. The relative amounts of the membrane-bound and soluble forms as well as their response to detergents suggests that they are the cellular counterparts to the A and B forms of the transferase. The activity of Form A and the membrane-bound enzyme is stimulated to similar extents by various detergents. Triton-type detergents are more effective than Brij-type. Lysophosphatidylcholine is a potent stimulator of the activity of Form A but lysophosphatidylethanolamine is without effect and lysophosphatidylserine and lysophosphatidylglycerol are inhibitory. C16-18 acyl derivatives of lysophosphatidylcholine stimulate the activity more extensively than the C14 acyl derivative, and the C12 acyl derivative is without effect. In contrast, Form B is fully active in the absence of all detergents tested although it is inactivated just as Form A by lysophosphatidylglycerol and octylglucoside. Kinetic analysis of Forms A and B reveal that detergents stimulate the activity of Form A by lowering the KD and KM of CMP-NeuAc and increasing the Vmax of the reaction. Form B in contrast, which is fully active in the absence of detergents, has kinetic parameters like those of Form A in the presence of detergent. Taken together, these results suggest that Form A of the sialyltransferase, but not Form B, contains a lipid-binding domain, and that binding of detergents or lipids to the domain modulates the activity of the enzyme." @default.
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• W1553971732 date "1985-10-01" @default.
• W1553971732 modified "2023-10-17" @default.
• W1553971732 title "Regulation of beta-D-galactoside alpha 2—-3 sialyltransferase activity. The effects of detergents and lysophosphatidates." @default.
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• W1553971732 doi "https://doi.org/10.1016/s0021-9258(17)38845-2" @default.
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