Download MendeleyCoupling sensor to enzyme in the voltage sensing phosphatase.
Yu, Y., Zhang, L., Li, B., Fu, Z., Brohawn, S.G., Isacoff, E.Y.(2024) Nat Commun 15: 6409-6409
- PubMed: 39080263
- DOI: https://doi.org/10.1038/s41467-024-50319-8
- Primary Citation of Related Structures:
9C49 - PubMed Abstract:
Voltage-sensing phosphatases (VSPs) dephosphorylate phosphoinositide (PIP) signaling lipids in response to membrane depolarization. VSPs possess an S4-containing voltage sensor domain (VSD), resembling that of voltage-gated cation channels, and a lipid phosphatase domain (PD). The mechanism by which voltage turns on enzyme activity is unclear. Structural analysis and modeling suggest several sites of VSD-PD interaction that could couple voltage sensing to catalysis. Voltage clamp fluorometry reveals voltage-driven rearrangements in three sites implicated earlier in enzyme activation-the VSD-PD linker, gating loop and R loop-as well as the N-terminal domain, which has not yet been explored. N-terminus mutations perturb both rearrangements in the other segments and enzyme activity. Our results provide a model for a dynamic assembly by which S4 controls the catalytic site.
Organizational Affiliation:
Department of Molecular and Cell Biology, University of California, Berkeley, California, USA.
