Structural highlights
FunctionA0A8I5ZQ24_RAT Subunit of the V1 complex of vacuolar(H+)-ATPase (V-ATPase), a multisubunit enzyme composed of a peripheral complex (V1) that hydrolyzes ATP and a membrane integral complex (V0) that translocates protons. V-ATPase is responsible for acidifying and maintaining the pH of intracellular compartments.[PIRNR:PIRNR032184] Publication Abstract from PubMedIntercellular communication in the nervous system occurs through the release of neurotransmitters into the synaptic cleft between neurons. In the presynaptic neuron, the proton pumping vesicular- or vacuolar-type ATPase (V-ATPase) powers neurotransmitter loading into synaptic vesicles (SVs), with the V(1) complex dissociating from the membrane region of the enzyme before exocytosis. We isolated SVs from rat brain using SidK, a V-ATPase-binding bacterial effector protein. Single particle electron cryomicroscopy allowed high-resolution structure determination of V-ATPase within the native SV membrane. In the structure, regularly spaced cholesterol molecules decorate the enzyme's rotor and the abundant SV protein synaptophysin binds the complex stoichiometrically. ATP hydrolysis during vesicle loading results in loss of V(1) from the SV membrane, suggesting that loading is sufficient to induce dissociation of the enzyme. High-resolution electron cryomicroscopy of V-ATPase in native synaptic vesicles.,Coupland CE, Karimi R, Bueler SA, Liang Y, Courbon GM, Di Trani JM, Wong CJ, Saghian R, Youn JY, Wang LY, Rubinstein JL Science. 2024 Jun 20:eadp5577. doi: 10.1126/science.adp5577. PMID:38900912[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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