Abstract
In the facultative photoheterotrophic bacterium Rhodobacter (Rhodopseudomonas) sphaeroides. photosynthetic units are localized within a system of intracytoplasmic membranes (ICM) that is believed to be continuous with the cytoplasmic membrane (1). These photosynthetic units consist of photochemical reaction centers together with two light-harvesting pigment-protein complexes designated as B800–850 and B875 on the basis of near-IR absorbance maxima. B875 is thought to surround and interconnect reaction centers with B800–850 arranged peripherally in large lakes (2). The manner in which these structures are assembled and become organized within the membrane remains largely unknown.
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