title: Antenna organization in the purple sulfur bacteria Chromatium tepidum and Chromatium vinosum.
abstract: 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.
authors.affiliation: Department of Biophysics, University of Leiden, P.O. Box 9504, 2300 RA, Leiden, The Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Kramer
authors.forename: J
authors.initials: J
authors.lastname: Amesz