Part:BBa_K352003

pCooM Promoter from Rhodospirillum rubrum

PcooF and PcooM, the two CooA-regulated R. rubrum promoters, contain 2-fold symmetric DNA sequences which are CooA-binding sites and are similar to the CRP consensus sequence. This similarity corralates with the tantamount helix-turn-helix motifs CooA and CRP. The CooA binding sites lie at the 243.5 and 238.5 positions relative to the transcription start sites in PcooF and PcooM, respectively, overlapping with the 235 region. This overlap suggests that both CooA-regulated promoters are analogous to class II CRP-dependent promoters. We chose PcooF for this study because it is the stronger promoter based on the amount of primer extension product and level of coo-encoded proteins synthesized in vivo. The two CO regulated transcriptional units, cooMKLXUH and cooFSCTJ, is the reason for the CO-dependent anaerobic growth of Rhodospirillum rubrum and enable the bacteria to oxidize CO . The coo regulon has three main products which are listed as O2-sensitive CO dehydrogenase (CooS), CooS-associated Fe-S protein (CooF), CO-tolerant hydrogenase (CooH). CooA is responsible for the expression of the genes of these proteins and activates by sensing CO in anaerobic environments. Because of the lack of active CooA, CO-independent basal level transcription of PcooF is not detectable.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]