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Plant and Cell Physiology Advance Access published online on October 17, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn157
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Identification of an F box protein that negatively regulates Pi starvation responses

Zhi-Hui Chen1, Gareth I. Jenkins and Hugh G. Nimmo*

Plant Science Group, Division of Biochemistry & Molecular Biology, Faculty of Biomedical & Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK

*Corresponding author. Prof. Hugh G. Nimmo, Bower Building, University of Glasgow, Glasgow G12 8QQ, UK, Phone +441413305058, Fax +441413304620, email h.g.nimmo@bio.gla.ac.uk


  Abstract

The Arabidopsis gene At5g21040 encodes a protein containing both WD40 and F-box motifs, termed FBX2. A T-DNA insertional mutant in this gene was obtained. Analysis of this mutant line showed that FBX2 is a negative regulator of several Pi starvation responses. FBX2 interacts with BHLH32, another negative regulator of Pi starvation responses. We suggest that FBX2 may be part of an SCF-like complex that recruits BHLH32 and its partners, potentially targeting the latter for proteolysis.

Keywords: Anthocyanin formation - Arabidopsis thaliana - F-box - Pi starvation - phosphoenolpyruvate carboxylase kinase - root hair

1 Present address: Division of Cell and Developmental Biology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, UK

(Received August 7, 2008; Accepted October 14, 2008)
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