Structure of the hexameric fungal plasma membrane proton pump in its autoinhibited state

S Heit, M Geurts, B Murphy, R Corey, D Mills, W Kühlbrandt, M Bublitz

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

The fungal plasma membrane H+-ATPase Pma1 is a vital enzyme, generating a proton-motive force that drives the import of essential nutrients. Autoinhibited Pma1 hexamers in the plasma membrane of starving fungi are activated by glucose signaling and subsequent phosphorylation of the autoinhibitory domain. As related P-type adenosine triphosphatases (ATPases) are not known to oligomerize, the physiological relevance of Pma1 hexamers remained unknown. We have determined the structure of hexameric Pma1 from Neurospora crassa by electron cryo-microscopy at 3.3-Å resolution, elucidating the molecular basis for hexamer formation and autoinhibition and providing a basis for structure-based drug development. Coarse-grained molecular dynamics simulations in a lipid bilayer suggest lipid-mediated contacts between monomers and a substantial protein-induced membrane deformation that could act as a proton-attracting funnel.
Original languageEnglish
JournalScience Advances
Early online date10 Nov 2021
DOIs
Publication statusE-pub ahead of print - 10 Nov 2021

Keywords

  • P-type ATPase
  • ion channel

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