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JXB Advance Access published online on June 27, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl021
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received December 28, 2005
Accepted April 11, 2006

RESEARCH PAPER

A putative acyl-CoA-binding protein is a major phloem sap protein in rice (Oryza sativa L.)

Nobuo Suzui 1 *, Shin-ichi Nakamura 2, Toru Fujiwara 3, Hiroaki Hayashi 4, and Tadakatsu Yoneyama 1

1 Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
2 Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita-city, Akita, 010-0195, Japan
3 Biotechnology Research Center, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; PRESTO, JST, Honcho, Kawaguchi, Saitama, 332-0012 Japan
4 Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; Present address: 694 Futago, Aki, Higashikunisaki, Oita 873-0356, Japan

* To whom correspondence should be addressed.
Nobuo Suzui, E-mail: suzui.nobuo{at}jaea.go.jp


  Abstract

The N-terminal amino-acid sequence of a major rice phloem-sap protein, named RPP10, was determined. RPP10 is encoded by a single gene in the rice genome. Its complete amino-acid sequence, predicted from the corresponding rice full-length cDNA, showed high similarity to plant acyl-CoA-binding proteins (ACBPs). Western blot analysis using anti-ACBP antiserum revealed that putative ACBP is abundant in the phloem sap of rice plants, and is also present in sieve-tube exudates of winter squash (Cucurbita maxima), oilseed rape (Brassica napus), and coconut palm (Cocos nucifera). These findings give rise to the idea that ACBP may involve lipid metabolism and regulation in the phloem.

Keywords: Acyl-CoA-binding protein; Oryza sativa; phloem; rice; sieve tube.
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