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Plant and Cell Physiology, 2002, Vol. 43, No. 10 1244-1249
© 2002 Oxford University Press

Short Communications

A Truncated Mutant of the Extrinsic 23-kDa Protein that Absolutely Requires the Extrinsic 17-kDa Protein for Ca2+ Retention in Photosystem II

Kentaro Ifuku and Fumihiko Sato1

Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Sakyo, Kyoto, 606-8502 Japan

Abstract

One function of the extrinsic 23-kDa protein in photosystem II (OEC23) is to retain Ca2+ and Cl–, two essential cofactors for photosynthetic oxygen evolution. A truncated mutant of OEC23 (OEC23 {Delta}19) revealed that 19 residues of the N-terminus of OEC23 were necessary for Ca2+ retention but not for its proper interaction with OEC17, the extrinsic 17-kDa protein in photosystem II. The lost ability of OEC23 {Delta}19 to reconstitute the oxygen-evolving activity was partially restored by OEC17 binding, suggesting the involvement of OEC17 in Ca2+ retention in photosystem II.

Footnotes

1 Corresponding author: E-mail, fumihiko@kais.kyoto-u.ac.jp; Fax, +81-75-753-6398.


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K. Ifuku, Y. Yamamoto, T.-a. Ono, S. Ishihara, and F. Sato
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[Abstract] [Full Text] [PDF]


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