First published online May 16, 2003; 10.1105/tpc.010256
The Plant Cell, Vol. 15, 1263-1280,
June 2003, Copyright © 2003,
American Society of Plant Biologists
Role of Nicotianamine in the Intracellular Delivery of Metals and Plant Reproductive Development
Michiko Takahashia,
Yasuko Teradab,
Izumi Nakaib,
Hiromi Nakanishic,
Etsuro Yoshimurac,
Satoshi Moric and
Naoko K. Nishizawa1,a,d
a Laboratory of Plant Biotechnology, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
b Department of Applied Chemistry, Science University of Tokyo, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
c Laboratory of Plant Molecular Physiology, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
d Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, 332-0012 Saitama, Japan
1 To whom correspondence should be addressed. E-mail annaoko{at}mail.ecc.u-tokyo.ac.jp; fax 81-3-6801-9557
Nicotianamine (NA), a chelator of metals, is ubiquitously present in higher plants. Nicotianamine aminotransferase (NAAT) catalyzes the amino group transfer of NA in the biosynthetic pathway of phytosiderophores and is essential for iron acquisition in graminaceous plants. The gene that encodes NAAT from barley was introduced into the nongraminaceous plant tobacco, which produces NA but not phytosiderophores. Transgenic tobacco plants (naat tobacco) that constitutively expressed the NAAT gene had young leaves with interveinal chlorosis and flowers that were abnormally shaped and sterile. Endogenous NA was consumed as a result of NAAT overproduction in naat tobacco. The resulting NA shortage caused disorders in internal metal transport, leading to these abnormal phenotypes. In addition to its role in long-distance metal transport, NA may be involved in the regulation of metal transfer within the cells. These results suggest that a shortage of NA impaired the functions of metal-requiring proteins, including transcription factors.
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