Involvement of DEG5 and DEG8 proteases in the turnover of the photosystem II reaction center D1 prot

• 作 者: SUN XuWu WANG LiYuan ZHANG LiX
• 机 构: Key Laboratory of Arid and Grassland Ecology,Key Laboratory of Photosynthesis and Environmental Mole
• 出 处: 科学通报（英文版）
• 发表日期: 2004年期
• 关键词: DEG proteases D1 protein degradation PSII reaction center Arabidopsis thaliana

Deg5,deg8 and the double mutant,deg5deg8 of Arabidopsis thaliana were used to study the physiological role of the DEG proteases in the repair cycle of photosystem II (PSII) under heat stress. PSII activity in deg mutants showed increased sensitivity to heat stress,and the extent of this effect was greater in the double mutant,deg5deg8,than in the single mutants,deg5 and deg8. Degradation of the D1 protein was slower in the mutants than in the WT plants. Furthermore,the levels of other PSII reaction center proteins tested remained relatively stable in the mutant and WT plants following high-temperature treatment. Thus,our results indicate that DEG5 and DEG8 may have synergistic function in degradation of D1 protein under heat stress.