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J Exp Bot. 2009;60(11):3179-93. doi: 10.1093/jxb/erp153. Epub 2009 May 19.

AtRAB-H1b and AtRAB-H1c GTPases, homologues of the yeast Ypt6, target reporter proteins to the Golgi when expressed in Nicotiana tabacum and Arabidopsis thaliana.

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School of Life Sciences, Oxford Brookes University, Gipsy Lane, Oxford OX3 0BP, UK.


Ypt/Rab GTPases act as key regulators of intracellular traffic through the conformational differences exhibited by their GTP or GDP-bound forms. In this paper, two Arabidopsis Ypt6 homologues, AtRAB-H1(b) and AtRAB-H1(c) were characterized and compared. Using a live cell imaging approach, it is shown that yellow fluorescent protein-fusions (YFP) of AtRAB-H1(b) and AtRAB-H1(c) locate to the Golgi and to the cytosol in both Nicotiana tabacum and in Arabidopsis thaliana. In addition, YFP-AtRAB-H1(b) targets an as yet unknown compartment not labelled by YFP-AtRAB-H1(c) or Golgi markers. It is also shown that the subcellular location of YFP-AtRAB-H1(b) and YFP-AtRAB-H1(c) is affected by the state of GTP-binding and that expression of a GTP-deficient mutant results in increased apoplastic fluorescence of a secretory form of YFP.

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