Abstract
Both proteolipid proteins (PLP) and DM-20 were found to be present by the immunoblot technique in myelin isolated from quaking mouse brain; however, the relative concentration of these proteins in myelin from quaking brain was substantially reduced when compared to the control. Brain slices from littermate control and quaking mice were incubated with [3H]palmitic acid to determine the incorporation of fatty acid into myelin proteolipid proteins. Fluorography of gels containing myelin proteins from control and quaking mice brain revealed that both PLP and DM-20 were acylated. The incorporation of [3H]palmitic acid into quaking myelin PLP and DM-20 was reduced by 75% and 20% respectively of those in control brain. The significance of differential acylation of quaking myelin PLP and DM-20 is discussed with respect to availability of non-acylated pools of proteolipid proteins and the activities of acylating enzymes.
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