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• W2022831701 abstract "Postsynaptic densities (PSDs) were prepared by the aqueous two-phase extraction of synaptic membranes in the presence of n-octyl glucoside. Incubation of postsynaptic densities with [gamma-32P]ATP resulted in the incorporation of 32P into a range of proteins. Isolation of glycoproteins from 32P-labelled PSDs by affinity chromatography on concanavalin A-agarose identified the postsynaptic glycoprotein of apparent Mr 180,000 (gp180) as a substrate for endogenous protein kinase(s). When the phosphorylation reaction was performed in the presence of Ca2+ and calmodulin, there was an overall 13-fold increase in the phosphorylation of PSD proteins. The largest effects of calmodulin were associated with two proteins of molecular weights 51,000 and 60,000, which showed average calmodulin-dependent increases in phosphorylation of 68-fold. The phosphorylation of gp180 was increased 7.5-fold in the presence of calmodulin. Fifty percent of maximum phosphorylation of proteins and glycoproteins occurred with a free Ca2+ concentration of 0.3 X 10(-6) M. The amounts 12.6 micrograms/ml and 9.1 micrograms/ml of calmodulin were required for 50% of maximum phosphorylation of proteins and glycoproteins, respectively. Peptide mapping experiments identified three major phosphorylation sites in gp180. The phosphorylation of all three sites was increased in the presence of calmodulin. Phosphoamino acid analysis of gp180 revealed that [32P]phosphoserine and [32P]phosphothreonine were both produced during the phosphorylation reaction, with phosphoserine being the predominant product. The phosphorylation of both amino acids was increased in the presence of calmodulin. [32P]phosphotyrosine was also identified as a product of the phosphorylation of gp180." @default.
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• W2022831701 title "Phosphorylation of the Postsynaptic Density Glycoprotein gp 180 by Ca2+/Calmodulin-Dependent Protein Kinase" @default.
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• W2022831701 doi "https://doi.org/10.1111/j.1471-4159.1985.tb05532.x" @default.
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