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JXB Advance Access originally published online on June 27, 2006
Journal of Experimental Botany 2006 57(11):2571-2576; 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

RESEARCH PAPER

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

Nobuo Suzui1,*, Shin-ichi Nakamura2, Toru Fujiwara3,4, Hiroaki Hayashi1 {dagger} and Tadakatsu Yoneyama1

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

*Present address and to whom correspondence should be sent: Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1207, Japan. E-mail: suzui.nobuo{at}jaea.go.jp

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.

Key words: Acyl-CoA-binding protein, Oryza sativa, phloem, rice, sieve tube


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