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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1983 Dec;80(23):7342–7346. doi: 10.1073/pnas.80.23.7342

A synaptic vesicle antigen is restricted to the junctional region of the presynaptic plasma membrane.

K M Buckley, E S Schweitzer, G P Miljanich, L Clift-O'Grady, P D Kushner, L F Reichardt, R B Kelly
PMCID: PMC390051  PMID: 6359167

Abstract

The plasma membrane of electric organ nerve terminals has two domains that can be distinguished by monoclonal antibodies. A library of 111 mouse monoclonal antibodies raised to nerve terminals from Torpedo californica contains 4 antibodies that bind specifically to the outside of intact synaptosomes. The distribution of the binding sites of these monoclonal antibodies on the outside of intact nerve terminals was examined by immunofluorescence and immunoelectron microscopy. The binding sites of 3 (tor23, 25, and 132) are distributed uniformly over nerve trunks and fine terminal branches. The binding site of the fourth (tor70) is restricted to synaptic junctional regions. This antibody, but not the other 3, recognizes a major component of synaptic vesicles, a proteoglycan associated with the inner surface of the vesicle membrane. The difference in the pattern of binding of these monoclonal antibodies suggests that the region of the plasma membrane containing active zones is antigenically distinguishable from other nerve terminal plasma membrane. We suggest that the antigen recognized by tor70 is externalized by exocytosis of synaptic vesicles while other plasma antigens take a different route to the surface. The unexpected observation that the vesicle antigen remains on the surface after exocytosis and is prevented from diffusion from the synaptic junctional region would be consistent with an interaction between the vesicle proteoglycan and elements of the synaptic cleft.

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Selected References

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