Kinetics and dynamics for light state transition in cyanobacterium Spirulina platensis cells

Biochemical and Biophysical Research Communications
Xiuling XuJingquan Zhao

Abstract

Light state transition in oxygenic organisms was defined as the ability to equalize the excitation of the two photosystems for maximal photosynthetic efficiency. In cyanobacteria, extensive researches on state transition have continuously provided new knowledge in the past decades but the molecular mechanism and physiological significance are still ambiguous. In this work, kinetics and dynamics of the transition from state 1 to state 2 in cyanobacterium Spirulina platensis cells were studied at different intensity of orange light from 10 to 120 μmol m(-2) s(-1). It was revealed that the state transition worked constantly independent of light intensity while the rates varied. The synchronous fluorescence kinetics for phycobilisome (PBS) and photosystem components indicated that the state transition was entirely regulated by "mobile PBS", and continuously changed fluorescence amplitudes suggested a series of intermediate states were involved between state 1 and state 2. The dynamic property of PBS movement during the state transition was revealed by (1,0) distribution of photo-linkable PBSs, indicating a collective movement of all PBSs. The results suggest that state transition in cyanobacteria possesses not only physiological bu...Continue Reading

References

Feb 1, 1993·Biochemical Society Transactions·R C Ford, M A Cochrane
Jul 4, 2001·Trends in Plant Science·J F Allen, J Forsberg
Dec 29, 2004·Biochimica Et Biophysica Acta·Kai-Hong ZhaoHugo Scheer
Feb 25, 2005·Nature·Stéphane BellafioreJean-David Rochaix
Oct 4, 2006·Biochimica Et Biophysica Acta·Heng LiJingquan Zhao

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