A previously unknown maltose transporter essential for starch degradation in leaves

被引：358

作者：

Niittylä, T

Messerli, G

Trevisan, M

Chen, J

Smith, AM ^{[1
]}

Zeeman, SC

机构：

[1] John Innes Ctr Plant Sci Res, Dept Metab Biol, Norwich NR4 7UH, Norfolk, England

[2] Univ Bern, Inst Plant Sci, CH-3013 Bern, Switzerland

[3] Acad Sinica, Inst Mol Biol, Taipei 115, Taiwan

来源：

SCIENCE | 2004年 / 303卷 / 5654期

关键词：

D O I：

10.1126/science.1091811

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A previously unknown maltose transporter is essential for the conversion of starch to sucrose in Arabidopsis leaves at night. The transporter was identified by isolating two allelic mutants with high starch levels and very high maltose, an intermediate of starch breakdown. The mutations affect a gene of previously unknown function, MEX1. We show that MEX1 is a maltose transporter that is unrelated to other sugar transporters. The severe mex1 phenotype demonstrates that MEX1 is the predominant route of carbohydrate export from chloroplasts at night. Homologous genes in plants including rice and potato indicate that maltose export is of widespread significance.

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收藏

页码：87 / 89

页数：3

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