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Plant and Cell Physiology, 2000, Vol. 41, No. 8 977-981
© 2000 Oxford University Press

Ser162-Dependent Inactivation of Overproduced Sucrose-Phosphate Synthase Protein of Maize Leaf in Transgenic Rice Plants

Sakiko Takahashi1,3, Kiyomi Ono1,4, Masashi Ugaki2,5, Ken Ishimaru1, Naohiro Aoki1,6 and Ryu Ohsugi1

1 Department of Plant Physiology, National Institute of Agrobiological Resources, Kannondai, Tsukuba, Ibaraki, 305-8602 Japan 2 Department of Biotechnology, National Institute of Agrobiological Resources, Kannondai, Tsukuba, Ibaraki, 305-8602 Japan

To investigate the role of Ser162 in phosphorylation-dependent regulation of maize sucrose-phosphate synthase (SPS) activities in rice, transgenic rice plants expressing wild-type or mutagenized maize SPS were produced. Our results indicate that Ser162 was responsible for overproduction-induced inactivation of SPS protein and for light/dark modulation of this protein in vivo.

3 Corresponding author: E-mail, sakiko@ss.abr.go.jp; Fax, +81-298-38-8347.

4 Present address: Plant Biotech Research Center, Research Institute of Meijo University, Shiogamaguchi, Tenpaku-ku, Nagoya, 468-8502 Japan.

5 Present address: Department of Integrated Biosciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo, 113-8657 Japan.

6 Present address: CSIRO Plant Industry, GPO BOX 1600, Canberra, ACT 2601, Australia.


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