VPS4 is a dynamic component of the centrosome that regulates centrosome localization of γ-tubulin, centriolar satellite stability and ciliogenesis

Sci Rep. 2018 Feb 20;8(1):3353. doi: 10.1038/s41598-018-21491-x.

Abstract

The hexameric AAA ATPase VPS4 facilitates ESCRT III filament disassembly on diverse intracellular membranes. ESCRT III components and VPS4 have been localized to the ciliary transition zone and spindle poles and reported to affect centrosome duplication and spindle pole stability. How the canonical ESCRT pathway could mediate these events is unclear. We studied the association of VPS4 with centrosomes and found that GFP-VPS4 was a dynamic component of both mother and daughter centrioles. A mutant, VPS4EQ, which can't hydrolyze ATP, was less dynamic and accumulated at centrosomes. Centrosome localization of the VPS4EQ mutant, caused reduced γ-tubulin levels at centrosomes and consequently decreased microtubule growth and altered centrosome positioning. In addition, preventing VPS4 ATP hydrolysis nearly eliminated centriolar satellites and paused ciliogensis after formation of the ciliary vesicle. Zebrafish embryos injected with GFP-VPS4EQ mRNA were less viable, exhibited developmental defects and had fewer cilia in Kupffer's vesicle. Surprisingly, ESCRT III proteins seldom localized to centrosomes and their depletion did not lead to these phenotypes. Our data support an ESCRT III-independent function for VPS4 at the centrosome and reveal that this evolutionary conserved AAA ATPase influences diverse centrosome functions and, as a result, global cellular architecture and development.

Publication types

  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3T3 Cells
  • ATPases Associated with Diverse Cellular Activities / analysis*
  • ATPases Associated with Diverse Cellular Activities / genetics
  • Animals
  • Centrosome / enzymology*
  • Centrosome / metabolism*
  • Cilia / metabolism*
  • Endosomal Sorting Complexes Required for Transport / analysis*
  • Endosomal Sorting Complexes Required for Transport / genetics
  • Endosomal Sorting Complexes Required for Transport / metabolism
  • Mice
  • Mutant Proteins / genetics
  • Mutant Proteins / metabolism
  • Tubulin / metabolism*
  • Vacuolar Proton-Translocating ATPases / analysis*
  • Vacuolar Proton-Translocating ATPases / genetics
  • Zebrafish

Substances

  • Endosomal Sorting Complexes Required for Transport
  • Mutant Proteins
  • Tubulin
  • Vacuolar Proton-Translocating ATPases
  • ATPases Associated with Diverse Cellular Activities
  • Vps4a protein, mouse