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Pigment organization and energy transfer in the green photosynthetic bacterium Chloroflexus aurantiacus: I. The cytoplasmic membrane by Henk Vasmel; Rob J. Van Dorssen; Gert J. De Vos; Jan Amesz is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Pigment organization and energy transfer in the green photosynthetic bacterium Chloroflexus aurantiacus: I. The cytoplasmic membrane about?

We have studied the pigment arrangement in purified cytoplasmic membranes of the thermophilic green bacterium Chloroflexus aurantiacus. The membranes contain 30-35 antenna bacteriochlorophyll a molecules per reaction center; these are organized in the B808-866 light-harvesting complex, together with carotenoids in a 2:1 molar ratio. Measurements of linear dichroism in a pressed polyacrylamide gel permitted the accurate determination of the orientation of the optical transition dipole moments with respect to the membrane plane. Combination of linear dichroism and low temperature fluorescence polarization data shows that the Qy transitions of the BChl 866 molecules all lie almost perfectly parallel to the membrane plane, but have no preferred orientation within the plane. The BChl 808 Qy transitions make an average angle of about 44° with this plane. This demonstrates that there are clear structural differences between the B808-866 complex of C. aurantiacus and the B800-850 complex of purple bacteria. Excitation energy transfer from carotenoid to BChl a proceeds with about 40% efficiency, while the efficiency of energy transfer from BChl 808 to BChl 866 approaches 100%. From the mini

Who reads Pigment organization and energy transfer in the green photosynthetic bacterium Chloroflexus aurantiacus: I. The cytoplasmic membrane?

Author

Henk Vasmel; Rob J. Van Dorssen; Gert J. De Vos; Jan Amesz

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0166-8595)

Published

1986

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)