| Siliques Are Red 1 (SIAR1) from Arabidopsis Acts as a Bidirectional Amino Acid Transporter that is Crucial for the Amino Acid Homeostasis of Siliques. | |
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MedLine Citation:
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PMID: 22312005 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Many membrane proteins are involved in the transport of nutrients in plants. While the import of amino acids into plant cells is, in principle, well understood, their export has been insufficiently described. Here, we present the identification and characterization of the membrane protein SiAR1 (Siliques Are Red 1) from Arabidopsis thaliana, that is able to translocate amino acids bidirectionally into as well as out of the cell. Analyses in yeast and oocytes suggest a SiAR1-mediated export of amino acids. In Arabidopsis, SiAR1 localizes to the plasma membrane and is expressed in the vascular tissue, in the pericycle, in stamen and in the chalazal seed coat of ovules and developing seeds. Mutant alleles of SiAR1 accumulate anthocyanins as a symptom of reduced amino acid content in the early stages of silique development. Our data demonstrate that the SiAR1-mediated export of amino acids plays an important role in organic nitrogen allocation and particularly in amino acid homeostasis in developing siliques. |
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Authors:
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Friederike Ladwig; Mark Stahl; Uwe Ludewig; Axel A Hirner; Ulrich Z Hammes; Ruth Stadler; Klaus Harter; Wolfgang Koch |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-6 |
Journal Detail:
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Title: Plant physiology Volume: - ISSN: 1532-2548 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 MoleCenter for Plancular Biology ,; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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