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Regulation of the mammalian-brain V-ATPase through ultraslow mode-switching - Nature.com

Regulation of the mammalian-brain V-ATPase through ultraslow mode-switching - Nature.com

Regulation of the mammalian-brain V-ATPase through ultraslow mode-switching - Nature.com
Nov 23, 2022 34 secs

In neurons, the loading of all neurotransmitters into synaptic vesicles is energized by about one V-ATPase molecule per synaptic vesicle6,7

To shed light on this bona fide single-molecule biological process, we investigated electrogenic proton-pumping by single mammalian-brain V-ATPases in single synaptic vesicles

Notably, direct observation of pumping revealed that physiologically relevant concentrations of ATP do not regulate the intrinsic pumping rate

By contrast, electrochemical proton gradients regulate the pumping rate and the switching of the pumping and inactive modes

A direct consequence of mode-switching is all-or-none stochastic fluctuations in the electrochemical gradient of synaptic vesicles that would be expected to introduce stochasticity in proton-driven secondary active loading of neurotransmitters and may thus have important implications for neurotransmission


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