PMID: 6404911May 1, 1983Paper

Synapsin I (Protein I), a nerve terminal-specific phosphoprotein. II. Its specific association with synaptic vesicles demonstrated by immunocytochemistry in agarose-embedded synaptosomes

The Journal of Cell Biology
P De CamilliPaul Greengard

Abstract

Synapsin I (protein I) is a major neuron-specific endogenous substrate for cAMP-dependent and Ca/calmodulin-dependent protein kinases that is widely distributed in synapses of the central and peripheral nervous system (De Camilli, P., R. Cameron, and P. Greengard, 1983, J. Cell Biol. 96:1337-1354). We have now carried out a detailed analysis of the ultrastructural localization of synapsin I in the synapse. For this purpose we have developed a novel immunocytochemical technique that involves the labeling of isolated synaptosomes immobilized in a thin agarose gel. Special fixation conditions were designed to maximize accessibility of synapsin I to marker molecules. Immunoferritin and immunoperoxidase studies of this preparation indicated that synapsin I is localized in the presynaptic compartment and that it is present in close to 100% of all nerve endings. Immunoferritin labeling also indicated that, inside the nerve ending, synapsin I is specifically associated with the cytoplasmic surface of synaptic vesicles. In agreement with these immunoferritin results, the labeling produced by immunoperoxidase was compatible with a specific association of synapsin I with synaptic vesicle membranes. However, at variance with the very speci...Continue Reading

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