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The stoichiometry of the structural proteins of the photosynthetic apparatus in purple photosynthetic bacteria is achieved primarily by complex regulation of the levels of mRNA encoding the different proteins, which has been studied in the greatest detail in the puf  operon. Here we investigated the transcriptional and posttranscriptional regulation of the  puc  operon, which encodes the peripheral light harvesting complex LHII. We show that, analogous to the  puf  operon, a primary transcript encoding five  puc  genes is rapidly processed to generate more stable RNA subspecies. Contrary to previous hypotheses, translational coupling and regulation of  puc  transcription by  puc  gene products were found not to occur. A putative RNA stem-loop structure appears to attenuate transcription initiated at the  puc operon major promoter. We also found that a minor pucD -internal promoter contributes to the levels of a message that encodes the LHII 14-kDa γ (PucE) protein.

Transcript Cleavage, Attenuation, and an Internal Promoter in the Rhodobacter capsulatus puc Operon