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Localization of SH-PTP1 to synaptic vesicles: a possible role in neurotransmission
B P Jena1, P Webster, J P Geibel
1Department of Surgery, Yale University School of Medicine, New Haven, CT 06510, USA.
Cell Biology International
|August 1, 1997
Abstract:
The tyrosine kinase pp60src is known to phosphorylate synaptophysin and in doing so may regulate neurotransmitter release. The tyrosyl phosphorylated state of synaptophysin is dependent on pp60src kinase and the unknown protein tyrosine phosphate phosphohydrolase (PTPase, EC 3.1.3.48). Here we report the protein tyrosine phosphate phosphohydrolase SH-PTP1, to associate with synaptic vesicles and interact with synaptophysin. These studies identify SH-PTP1 as a new member of the secretory machinery at the nerve terminal and suggest its involvement in neurotransmission.