The mobility of PSI and PQ molecules in Spirulina platensis cells during state transition

doi:10.1007/s11120-008-9400-4

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	The mobility of PSI and PQ molecules in Spirulina platensis cells during state transition
	Zhang, Rui; Xie, Jie; Zhao, Jingquan
刊名	PHOTOSYNTHESIS RESEARCH
	2009-02-01
卷号	99 期号:2 页码:107-113
关键词	Cyanobacterium Mobility State Transition Phycobilisomes Photosystem i Monomerization Trimerization
ISSN号	0166-8595
DOI	10.1007/s11120-008-9400-4
英文摘要	Monomerization and trimerization of photosystem I (PSI) in cyanobacteria are reversible to response to light switched off and on, which leads to "energy spillover" to regulate excitation of the two photosystems in balance. Considering that PSI is a trans-membrane protein embedded in thylakoid membranes, the monomerization or trimerization must involve a movement of PSI in the membranes. In this work, the mobility of PSI was demonstrated by dependence of the monomerization and trimerization on temperature for intact Spirulina platensis cells undergoing a light-to-dark or a dark-to-light transition. Based on the characteristic absorbance of monomers and trimmers, it confirms that both monomerization and trimerization are temperature-sensitive. The relative populations of the monomers and trimmers are invariable above the phase transition temperature (T (PT)) while directly proportional to temperature below T (PT). On the other hand, the rate to reach the equilibrium population is proportional to temperature above T (PT) but invariable below T (PT). The PSI mobility and the temperature-dependent population are contrary to those of plastoquinone (PQ) molecules because PSI is a trans-membrane protein while PQ molecules are small diffusive electron carriers in thylakoid membranes as well as their distinctive sizes and environments. The less monomerization of PSI but the invariable time constant at lower temperature below T (PT) may be due to that accumulation of the reduced PQ molecules results in decrease of the stromal-side H(+) concentration which is a driving force of PSI monomerization.
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000263544900004
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/67867]
专题	中国科学院化学研究所
通讯作者	Zhao, Jingquan
作者单位	Chinese Acad Sci, Inst Chem, CAS Key Lab Photochem, Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Rui,Xie, Jie,Zhao, Jingquan. The mobility of PSI and PQ molecules in Spirulina platensis cells during state transition[J]. PHOTOSYNTHESIS RESEARCH,2009,99(2):107-113.
APA	Zhang, Rui,Xie, Jie,&Zhao, Jingquan.(2009).The mobility of PSI and PQ molecules in Spirulina platensis cells during state transition.PHOTOSYNTHESIS RESEARCH,99(2),107-113.
MLA	Zhang, Rui,et al."The mobility of PSI and PQ molecules in Spirulina platensis cells during state transition".PHOTOSYNTHESIS RESEARCH 99.2(2009):107-113.