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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kim, D. K. Catterall, W. A. |
| Description | Author Affiliation: Kim DK ( Department of Pharmacology, University of Washington, Seattle, WA 98195, USA.); |
| Abstract | Fast neurotransmission requires that docked synaptic vesicles be located near the presynaptic N-type or P/Q-type calcium channels. Specific protein-protein interactions between a synaptic protein interaction (synprint) site on N-type and P/Q-type channels and the presynaptic SNARE proteins syntaxin, SNAP-25, and synaptotagmin are required for efficient, synchronous neurotransmitter release. Interaction of the synprint site of N-type calcium channels with syntaxin and SNAP-25 has a biphasic calcium dependence with maximal binding at 10-20 microM. We report here that the synprint sites of the BI and rbA isoforms of the alpha1A subunit of P/Q-type Ca2+ channels have different patterns of interactions with synaptic proteins. The BI isoform of alpha1A specifically interacts with syntaxin, SNAP-25, and synaptotagmin independent of Ca2+ concentration and binds with high affinity to the C2B domain of synaptotagmin but not the C2A domain. The rbA isoform of alpha1A interacts specifically with synaptotagmin and SNAP-25 but not with syntaxin. Binding of synaptotagmin to the rbA isoform of alpha1A is Ca2+-dependent, with maximum affinity at 10-20 microM Ca2+. Although the rbA isoform of alpha1A binds well to both the C2A and C2B domains of synaptotagmin, only the interaction with the C2A domain is Ca2+-dependent. These differential, Ca2+-dependent interactions of Ca2+ channel synprint sites with SNARE proteins may modulate the efficiency of transmitter release triggered by Ca2+ influx through these channels. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 26 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Brain Metabolism Calcium Channels Calcium-Binding Proteins Calcium Membrane Glycoproteins Membrane Proteins Nerve Tissue Proteins Animals Escherichia Coli Presynaptic Terminals Qa-SNARE Proteins Synaptosomal-Associated Protein 25 Synaptotagmins Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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