J Integr Plant Biol. ›› 1994, Vol. 36 ›› Issue (8): -.

• Research Articles •    

CD Spectra of D1/D2/Cyt b559 Complax in Photodamaged Photosystem Ⅱ Reaction Center

Yu Zhen-bao, Li Chong-ci, Tang Chong-qin, Kuang Ting-yun, Lu Rong-he Tang Pei-song   

Abstract: The CD spectrum of photosystem Ⅱ reaction center D1/D2/Cyt b559 complex showed a strong reverse band with positive peak at 680 nm and negative peak at 660 nm in the red absorption region (Qy band). After the D1/D2/Cyt b559 complex was illuminated by strong light, the CD signals of the complex decreased significantly in the red region in which the negative peak still existed but the positive one disappeared. The result suggested that the CD signal of photosystem Ⅱ reaction center D1/D2/Cyt b559 complex not only came from the primary donor, P680, but also from other pigments such as from accessory Chl a or Pheo a.

Key words: Photosystem Ⅱ, D1/D2/Cty b559 complex, CD spectrum, Photodamage

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