Antenna organization in the purple sulfur bacteria Chromatium tepidum and Chromatium vinosum

被引:7
作者
Kramer, H [1 ]
Amesz, J [1 ]
机构
[1] LEIDEN UNIV,DEPT BIOPHYS,NL-2300 RA LEIDEN,NETHERLANDS
关键词
light harvesting; singlet-singlet annihilation; domain size; fluorescence; (C-tepidum; C-vinosum);
D O I
10.1007/BF00034784
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Structural aspects of the core antenna in the purple sulfur bacteria Chromatium tepidum and Chromatium vinosum were studied by means of fluorescence emission and singlet-singlet annihilation measurements. In both species the number of bacteriochlorophylls of the core antenna between which energy transfer can occur corresponds to one core-reaction center complex only. From measurements of variable fluorescence we conclude that in C. tepidum excitation energy can be transferred back from the core antenna (B920) to the peripheral B800-850 complex in spite of the relatively large energy gap, and on basis of annihilation measurements a model of separate core-reaction center units accompanied by their own peripheral antenna is suggested. C. vinosum contains besides a core antenna, B890, two peripheral antennae, B800-820 and B800-850. Energy transfer was found to occur from the core to B800-850, but not to B800-820, and it was concluded that in C. vinosum each core-reaction center complex has its own complement of B800-850. The results reported here are compared to those obtained earlier with various strains and species of purple non-sulfur bacteria.
引用
收藏
页码:237 / 244
页数:8
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