A Previously Unknown Maltose Transporter Essential for Starch Degradation in Leaves-Reference-Cited by-同舟云学术

A Previously Unknown Maltose Transporter Essential for Starch Degradation in Leaves

Published:2004-01-02 Issue:5654 Volume:303 Page:87-89
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Niittylä Totte¹²³,Messerli Gaëlle¹²³,Trevisan Martine¹²³,Chen Jychian¹²³,Smith Alison M.¹²³,Zeeman Samuel C.¹²³

Affiliation:

1. Department of Metabolic Biology, John Innes Centre, Norwich NR4 7UH, UK.

2. Institute of Plant Sciences, University of Bern, Altenbergrain 21, CH–3013 Bern, Switzerland.

3. Institute of Molecular Biology, Academia Sinica, Taipei 115, Taiwan.

Abstract

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 MEX1is a maltose transporter that is unrelated to other sugar transporters. The severe mex1 phenotype demonstrates that MEX1is 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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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