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Search Purification (Commentary)

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Binding of the enzyme to lipid bilayers containing biological fractions of anionic lipids is essentially irreversible under most conditions examined. Binding is strongly influenced by anionic lipids, by nonbilayer-prone molecules and by charged polypeptides. Binding to membranes follows a two-step process. The binding is faster and stronger by electrostatic attraction, but hydrophobic interactions are also involved in enhancing the binding and activation process. Once the enzyme is bound to the membrane, it is practically glued in an irreversible fashion
during purification, the concentration of detergent is just as important as the type of detergent, and a low concentration of n-dodecyl-beta-D-maltoside (about 1 x critical micelle concentration) is the best for keeping the protein stable and homogeneous
proteolytic resistance shows a good correlation with the enzyme activity in various lipid-CHAPS mixed micelles. Anionic lipids 1,2-dioleoyl-phosphatidylglycerol and 1,2-dioleoyl-posphatidylserine are able to protect the exposed MGlc-DAG synthase from digestion, whereas 1,2-dioleoyl-phosphatidylcholine and diglucosyldiacylglycerol can not. The detergent dodecylphosphoglycerol can also stimulate the MGlcDAG synthase activity efficiently with a concomitant protection toward proteolytic digestion
Results 1 - 4 of 4