Comparison of the Structural Subunit, B820, of Core Light-Harvesting Complexes of Photosynthetic Bacteria
The photoreceptor complexes of Rhodobacter sphaeroides and Rhodobacter capsulatus have many features in common. Their reaction centers have about 80% homology between the amino acid sequences of their respective L, M, and H polypeptides (1). The electrochemical and spectroscopic details for the primary photochemical events are nearly identical (2). Both have a core light-harvesting (LH) complex with a Qy band near 875 nm and an accessory LH complex, B800–850, whose amount varies inversely with the light intensity used for growing the bacteria.
KeywordsRhodobacter Sphaeroides Structural Subunit Rhodobacter Capsulatus BChl Molecule Hydrogen Bonding Group
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