TIME-RESOLVED POLARIZED ABSORPTION OF C-PHYCOCYANIN FROM THE CYANOBACTERIUM WESTIELLOPSIS-PROLIFICA

	TIME-RESOLVED POLARIZED ABSORPTION OF C-PHYCOCYANIN FROM THE CYANOBACTERIUM WESTIELLOPSIS-PROLIFICA
	Xia A. D.; Zhu J. C.; Wu H. J.; Jiang L. J.; Zhang X. Y.; Sudha M.; Sai P. S. M.
	1993
发表期刊	Journal of Photochemistry and Photobiology B-Biology
ISSN	1011-1344
卷号	19 期号:2 页码:111-117
摘要	The energy transfer processes within C-phycocyanin monomers and trimers isolated from the cyanobacterium Westiellopsis prolifica were studied using picosecond polarized absorption techniques. In C-phycocyanin monomers, the fast depolarization time of about 52 ps was interpreted to be due to transfer from beta(s) to beta(f) in one beta subunit. The long-lived anisotropic relaxation component in the range 2.4-4.6 ns was due to Brownian rotation of the chromophore-protein molecule. In C-phycocyanin trimers, two kinetic components of about 33 ps and 123-198 ps were observed and assigned to different isotropic relaxation processes. However, the alpha and beta(f) chromophores in adjacent alphabeta monomers are expected to form electronic interaction, which results in pairwise delocalization of the excitation between the two chromophores (K. Sauer and H. Scheer, Biochim. Biophys. Acta, 936 (1988) 157-170). We attributed the shortest time constant of about 33 ps to a heterogeneous, directed relaxation from the upper exciton state to the ground state due to the site heterogeneity, which is suggested from hole-burning experiments (W. Kohler et al., Chem. Phys. Lett., 143 (1988) 169-173). The lifetime in the range 123-198 ps is probably due mainly to homogeneous energy transfer in the same monomer, such as 1beta(s)-->1beta(f), and/or excitation equilibration between beta(f) chromophores in different monomers, such as 1beta(f)<->2beta(f). These isotropic lifetimes in C-phycocyanin trimers are in agreement with the anisotropic relaxations also studied in this paper.
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/34420
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Xia A. D.,Zhu J. C.,Wu H. J.,et al. TIME-RESOLVED POLARIZED ABSORPTION OF C-PHYCOCYANIN FROM THE CYANOBACTERIUM WESTIELLOPSIS-PROLIFICA[J]. Journal of Photochemistry and Photobiology B-Biology,1993,19(2):111-117.
APA	Xia A. D..,Zhu J. C..,Wu H. J..,Jiang L. J..,Zhang X. Y..,...&Sai P. S. M..(1993).TIME-RESOLVED POLARIZED ABSORPTION OF C-PHYCOCYANIN FROM THE CYANOBACTERIUM WESTIELLOPSIS-PROLIFICA.Journal of Photochemistry and Photobiology B-Biology,19(2),111-117.
MLA	Xia A. D.,et al."TIME-RESOLVED POLARIZED ABSORPTION OF C-PHYCOCYANIN FROM THE CYANOBACTERIUM WESTIELLOPSIS-PROLIFICA".Journal of Photochemistry and Photobiology B-Biology 19.2(1993):111-117.

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