Fig. 2From: regO: a novel locus in the regulation of tetrapyrrole biosynthesis in Rhodospirillum rubrumDomain structure of RegO generated by SMART (http://smart.ambl-heidelberg.de/ ). Multi-domain hybrid structure of RegO in Rsp. rubrum. RegO possesses two PAS domains, a histidine kinase (HisKA) domain and HATPase domainBack to article page