Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 57, Issue 11, Pages 2571-2576Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erl021
Keywords
acyl-CoA-binding protein; Oryza sativa; phloem; rice; sieve tube
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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.
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