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Plant and Cell Physiology Advance Access originally published online on October 17, 2008
Plant and Cell Physiology 2008 49(12):1902-1906; 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 email: journals.permissions@oxfordjournals.org

Short Communication

Identification of an F-Box Protein that Negatively Regulates Pi Starvation Responses

Zhi-Hui Chen1,2, Gareth I. Jenkins1 and Hugh G. Nimmo1,*

1Plant Science Group, Division of Biochemistry & Molecular Biology, Faculty of Biomedical & Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK

*Corresponding author: E-mail, h.g.nimmo{at}bio.gla.ac.uk; Fax, +44-14133-04620.


  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

Abbreviations: bHLH, basic helix–loop–helix; CaMV, cauliflower mosaic virus; GFP, green fluorescent protein; GST, glutathione S-transferase; RT–PCR, reverse transcription–PCR

2Present 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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