The Arabidopsis sex1 mutant is defective in the R1 protein, a general regulator of starch degradation in plants, and not in the chloroplast hexose transporter

被引:252
作者
Yu, TS
Kofler, H
Häusler, RE
Hille, D
Flügge, UI
Zeeman, SC
Smith, AM
Kossmann, J
Lloyd, J
Ritte, G
Steup, M
Lue, WL
Chen, JC
Weber, A [1 ]
机构
[1] Acad Sinica, Inst Mol Biol, Taipei, Taiwan
[2] Univ Cologne, Lehrstuhl Bot 2, D-50931 Cologne, Germany
[3] John Innes Ctr, Norwich NR4 7UH, Norfolk, England
[4] Max Planck Inst Mol Pflanzenphysiol, D-14476 Golm, Germany
[5] Univ Potsdam, Inst Biochem & Biol, Arbeitsgrp Pflanzenphysiol, D-14476 Golm, Germany
关键词
D O I
10.1105/tpc.13.8.1907
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Starch is the major storage carbohydrate in higher plants and of considerable importance for the human diet and for numerous technical applications. In addition, starch can be accumulated transiently in chloroplasts as a temporary deposit of carbohydrates during ongoing photosynthesis. This transitory starch has to be mobilized during the subsequent dark period. Mutants defective in starch mobilization are characterized by high starch contents in leaves after prolonged periods of darkness and therefore are termed starch excess (sex) mutants. Here we describe the molecular characterization of the Arabidopsis sex1 mutant that has been proposed to be defective in the export of glucose resulting from hydrolytic starch breakdown. The mutated gene in sex1 was cloned using a map-based cloning approach. By complementation of the mutant, immunological analysis, and analysis of starch phosphorylation, we show that sex1 is defective in the Arabidopsis homolog of the R1 protein and not in the hexose transporter. We propose that the SEX1 protein (R1) functions as an overall regulator of starch mobilization by controlling the phosphate content of starch.
引用
收藏
页码:1907 / 1918
页数:12
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