Abstract
Two distinct types of pigment-protein complexes are required for photosynthesis in the purple non-sulfur bacterium Rhodobacter capsulatus (formerly Rhodopseudomonas capsulata), the antenna or light-harvesting (LH) complexes, and the photochemical reaction center (RC) (for reviews 1,2). Both the LH complexes and the RC are intrinsic membrane complexes that are asymmetrically oriented across the photosynthetic membrane (PM). The LH complexes, which are subdivided into two groups based upon their near-infrared absorption maxima (LHI, 870 nm; LHII 800 and 860 nm), direct the energy of absorbed photons to the RC where primary photochemistry occurs.
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