The vacuolar proton-ATPase plays a major role in several membrane-bounded organelles in Paramecium

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2005
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Wassmer, Thomas
Froissard, Marine
Cohen, Jean
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Journal of Cell Science. 2005, 118(13), pp. 2813-2825. ISSN 0021-9533. eISSN 1477-9137
Zusammenfassung

The vacuolar proton-ATPase (V-ATPase) is a multisubunit enzyme complex that is able to transfer protons over membranes against an electrochemical potential under ATP hydrolysis. The enzyme consists of two subcomplexes: V0, which is membrane embedded; and V1, which is cytosolic. V0 was also reported to be involved in fusion of vacuoles in yeast. We identified six genes encoding csubunits (proteolipids) of V0 and two genes encoding Fsubunits of V1 and studied the role of the V-ATPase in trafficking in Paramecium. Green fluorescent protein (GFP) fusion proteins allowed a clear subcellular localization of c- and F-subunits in the contractile vacuole complex of the osmoregulatory system and in food vacuoles. Several other organelles were also detected, in particular dense core secretory granules (trichocysts). The functional significance of the V-ATPase in Paramecium was investigated by RNA interference (RNAi), using a recently developed feeding method. A novel strategy was used to block the expression of all six c- or both F-subunits simultaneously. The V-ATPase was found to be crucial for osmoregulation, the phagocytotic pathway and the biogenesis of dense core secretory granules. No evidence was found supporting participation of V0 in membrane fusion.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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V-ATPase, RNAi, Contractile vacuole, Phagosome, Trichocyst
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ISO 690WASSMER, Thomas, Marine FROISSARD, Helmut PLATTNER, Roland KISSMEHL, Jean COHEN, 2005. The vacuolar proton-ATPase plays a major role in several membrane-bounded organelles in Paramecium. In: Journal of Cell Science. 2005, 118(13), pp. 2813-2825. ISSN 0021-9533. eISSN 1477-9137
BibTex
@article{Wassmer2005vacuo-7009,
  year={2005},
  title={The vacuolar proton-ATPase plays a major role in several membrane-bounded organelles in Paramecium},
  number={13},
  volume={118},
  issn={0021-9533},
  journal={Journal of Cell Science},
  pages={2813--2825},
  author={Wassmer, Thomas and Froissard, Marine and Plattner, Helmut and Kissmehl, Roland and Cohen, Jean}
}
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