Dephosphorylation of photosystem II proteins and phosphorylation of CP29 in barley photosynthetic membranes as a response to water stress
文献类型： 外文期刊
作者： Liu, Wen-Juan 3 ; Chen, Yang-Er 2 ; Tian, Wen-Juan 1 ; Du, Jun-Bo 2 ; Zhang, Zhong-Wei 2 ; Xu, Fei 1 ; Zhang, Fan 1 ; Yua 1 ;
作者机构： 1.Sichuan Univ, Minist Educ, Key Lab Bioresource & Ecoenvironm, Coll Life Sci, Chengdu 610064, Peoples R China
2.Sichuan Univ, Coll Life Sci, Lab Plant Physiol, Chengdu 610064, Peoples R China
3.Sichuan Acad Agr Sci, Ctr Anal & Testing, Chengdu 610066, Peoples R China
4.Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Coll Water Resources &
关键词： Dephosphorylation;Lateral migration;Phosphorylation;Photosystem II;Thylakoid phosphatase
期刊名称：BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS （ 影响因子：3.991； 五年影响因子：5.144 ）
ISSN： 0005-2728
年卷期： 2009 年 1787 卷 10 期
页码：
收录情况： SCI
摘要： Kinetic studies of protein dephosphorylation in barley thylakoid membranes revealed accelerated dephosphorylation of photosystem 11 (PSII) proteins, and meanwhile rapidly induced phosphorylation of a light-harvesting complex (LHCII) b4, CP29 under water stress. Inhibition of dephosphorylation aggravates stress damages and hampers photosystem recovery after rewatering. This increased dephosphorylation is catalyzed by both intrinsic and extrinsic membrane protein phosphatase. Water stress did not cause any thylakoid destacking, and the lateral migration from granum membranes to stroma-exposed lamellae was only found to CP29, but not other PSII proteins. Activation of plastid proteases and release of TLP40, an inhibitor of the membrane phosphatases, were also enhanced during water stress. Phosphorylation of CP29 may facilitate disassociation of LHCII from PSII complex, disassembly of the LHCII trimer and its subsequent degradation, while general dephosphorylation of PSII proteins may be involved in repair cycle of PSII proteins and stress-response-signaling. (C) 2009 Elsevier B.V. All rights reserved.
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