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Arabidopsis thaliana expresses two functional isoforms of Arvp, a protein involved in the regulation of cellular lipid homeostasis.

Biochim. Biophys. Acta. 2006 Jul;1761(7):725-35. Epub 2006 Apr 19
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摘要


Arv1p is involved in the regulation of cellular lipid homeostasis in the yeast Saccharomyces cerevisiae. Here, we report the characterization of the two Arabidopsis thaliana ARV genes and the encoded proteins, AtArv1p and AtArv2p. The functional identity of AtArv1p and AtArv2p was demonstrated by complementation of the thermosensitive phenotype of the arv1Delta yeast mutant strain YJN1756. Both A. thaliana proteins contain the bipartite Arv1 homology domain (AHD), which consists of an NH(2)-terminal cysteine-rich subdomain with a putative zinc-binding motif followed by a C-terminal subdomain of 33 amino acids. Removal of the cysteine-rich subdomain has no effect on Arvp activity, whereas the presence of the C-terminal subdomain of the AHD is critical for Arvp function. Localization experiments of AtArv1p and AtArv2p tagged with green fluorescent protein (GFP) and expressed in onion epidermal cells demonstrated that both proteins are exclusively targeted to the endoplasmic reticulum. Analysis of beta-glucuronidase (GUS) activity in transgenic A. thaliana plants carrying chimeric ARV1::GUS and ARV2::GUS genes showed that ARV gene promoters direct largely overlapping patterns of expression that are restricted to tissues in which cells are actively dividing or expanding. The results of this study support the notion that plants, yeast and mammals share common molecular mechanisms regulating intracellular lipid homeostasis.

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