PMID: 1374414Jun 1, 1992

Specific association of the proto-oncogene product pp60c-src with an intracellular organelle, the PC12 synaptic vesicle

The Journal of Cell Biology
A D LinstedtR B Kelly

Abstract

The protein product of the proto-oncogene c-src is a membrane-associated tyrosine kinase of unknown function. Identification of pp60c-src target membranes may elucidate the function of the c-src protein. The available evidence indicates that pp60c-src associates with distinct membranes within single cell types and has different distributions in different cell types. Our experiments demonstrate targeting of pp60c-src to an isolatable and biochemically identified membrane fraction in the neuroendocrine cell line PC12. The c-src protein was found to be specifically associated with synaptic vesicles since: (a) the pp60c-src immunofluorescent pattern overlapped with a synaptic vesicle marker, synaptophysin; (b) a significant proportion (44%) of the pp60c-src from PC12 but not fibroblast postnuclear supernatants was recovered in a small vesicle fraction; (c) an anti-synaptophysin cytoplasmic domain antibody immunodepleted all of the pp60c-src vesicles in this fraction, and (d) pp60c-src copurified during a 100-fold purification of PC12 synaptic vesicles. These results suggest a role for the c-src protein in the regulation of synaptic vesicle function.

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Related Concepts

anti-synaptophysin
Immunofluorescence Assay
Immunoblotting, Reverse
SRC gene
Tissue Membrane
Membrane Fraction
Synaptic Vesicles
PC12 Cells
Intracellular Organelle
SYP

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