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Functional analysis of Arabidopsis V-ATPase subunit VHA-E isoforms

Acidification of endomembrane compartments by the vacuolar H+-ATPase (V-ATPase) is an important mechanism to generate microenvironments suitable for various cellular functions. Differential assembly of subunit isoforms provides the potential to flexibly adapt the proton-pumping V-ATPase complex to c...

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Bibliographic Details
Main Authors: Dettmer, Jan (Author) , Liu, Tzu-Yin (Author) , Schumacher, Karin (Author)
Format: Article (Journal)
Language:English
Published: 2010
In: European journal of cell biology
Year: 2009, Volume: 89, Issue: 2-3, Pages: 152-156
ISSN:1618-1298
DOI:10.1016/j.ejcb.2009.11.008
Online Access:Verlag, Volltext: http://dx.doi.org/10.1016/j.ejcb.2009.11.008
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0171933509003379
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Author Notes:Jan Dettmer, Tzu-Yin Liu, Karin Schumacher

MARC

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520 |a Acidification of endomembrane compartments by the vacuolar H+-ATPase (V-ATPase) is an important mechanism to generate microenvironments suitable for various cellular functions. Differential assembly of subunit isoforms provides the potential to flexibly adapt the proton-pumping V-ATPase complex to changing physiological conditions and cell type-specific requirements. In Arabidopsis, the regulatory V-ATPase subunit E (VHA-E) is encoded by three genes with distinct expression patterns. We show here that VHA-E2, which belongs to a clade of pollen-specific VHA-E isoforms present in all higher plants, has a specialized but non-essential function during gametophyte development. Similarly, loss of the epidermis-specific isoform VHA-E3, which we show here to be transcriptionally regulated by the phytohormone jasmonic acid, does not cause obvious phenotypic changes. Furthermore, when expressed ubiquitously, VHA-E3, in contrast to VHA-E2, is able to complement loss of the essential subunit VHA-E1 indicating different degrees of functional specialization among the Arabidopsis VHA-E isoforms. 
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