R Venkat Kalyana Sundaram, Atrouli Chatterjee, Manindra Bera, Kirill Grushin, Aniruddha Panda, Feng Li, Jeff Coleman, Seong Lee, Sathish Ramakrishnan, Andreas M Ernst, Kallol Gupta, James E Rothman, Shyam S Krishnakumar
Here, we introduce the full functional reconstitution of genetically validated core protein machinery (SNAREs, Munc13, Munc18, Synaptotagmin, and Complexin) for synaptic vesicle priming and release in a geometry that enables detailed characterization of the fate of docked vesicles both before and after release is triggered with Ca2+ . Using this setup, we identify new roles for diacylglycerol (DAG) in regulating vesicle priming and Ca2+ -triggered release involving the SNARE assembly chaperone Munc13. We find that low concentrations of DAG profoundly accelerate the rate of Ca2+ -dependent release, and high concentrations reduce clamping and permit extensive spontaneous release...
August 22, 2023: Proceedings of the National Academy of Sciences of the United States of America