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Extremophiles

, Volume 18, Issue 4, pp 693–706 | Cite as

The accessory gas vesicle protein GvpM of haloarchaea and its interaction partners during gas vesicle formation

  • Stella Tavlaridou
  • Kerstin Winter
  • Felicitas Pfeifer
Original Paper

Abstract

Gas vesicles consist predominantly of the hydrophobic GvpA and GvpC, and the accessory proteins GvpF through GvpM are required in minor amounts during formation. GvpM and its putative interaction partners were investigated. GvpM interacted with GvpH, GvpJ and GvpL, but not with GvpG. Interactions were also observed in vivo in Haloferax volcanii transformants using Gvp fusions to the green fluorescent protein smGFP. Cells producing the hydrophobic MGFP contained a single fluorescent aggregate per cell, whereas cells containing LGFP or HGFP were fully fluorescent. The soluble LGFP formed stable co-aggregates with GvpM in LGFPM transformants, but the presence of GvpH resulted in the absence of MGFP foci in HMGFP transformants. Substitution- and deletion mutants of GvpM determined functionally important amino acids (aa). Substitution of a polar by a non-polar aa in the N-terminal region of GvpM had no effect, whereas a substitution of a non-polar by a polar aa in this region inhibited gas vesicle formation in transformants. Substitutions in region 44–48 of GvpM strongly reduced the number of gas vesicles, and deletions at the N-terminus resulted in Vac transformants. Gas vesicle morphology was not affected by any mutation, implying that GvpM is required during initial stages of gas vesicle assembly.

Keywords

Gas vesicle proteins Archaea Salt-adapted GFP Protein aggregation 

Notes

Acknowledgements

Karin Faist is thanked for help in electron microscopy. Sabrina Fröls and Arnulf Kletzin are thanked for valuable discussions, and Franz-Josef Meyer-Almes (h_da Darmstadt) for the use of the fluorescence reader. This work received financial support by the German Research Foundation, DFG (Pf 165/12-1).

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Copyright information

© Springer Japan 2014

Authors and Affiliations

  • Stella Tavlaridou
    • 1
  • Kerstin Winter
    • 1
  • Felicitas Pfeifer
    • 1
  1. 1.Mikrobiologie und Archaea, Fachbereich BiologieTechnische Universität DarmstadtDarmstadtGermany

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