The operon of was found to be bicistronic and to consist of the two genes and which encode a putative GTP-binding protein and an oxygen-independent coproporhyrinogen III oxidase, respectively. The operon is located immediately upstream of the operon. Both operons are transcribed in the same direction and are not separated by an obvious transcription-terminator-like structure. The operon is preceded by a potential vegetative promoter, and there is a putative strong intergenic terminator between and Northern blot experiments revealed only a transcript corresponding to but expression of was demonstrated in slot-blot and immunoblot experiments using antibodies raised against Histagged HemN. The data suggest that most of the transcripts originating at the potential vegetative promoter are terminated at the intergenic terminator. Readthrough transcription into the downstream operon was not found.


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