HemHp is a ROS-induced promoter controlled by OxyR (transcription factor) which is activated by ROS (Reactive Oxygen Species).
An intramolecular disulfide bond between Cys199 and Cys208 will form in an OxyR transcription factor, and active OxyR molecule will bind to the binding site of HemHp, making the following circuit turned on. In our project: Bee. coli, we use HemHp as the sensor of Bee. coli to sense Nosema ceranae. After Nosema ceranae enter bees' midgut, the natural immune reaction will lead to ROS released by epithelia of bees' midgut. We select several promoters that can be induced by OxyR (Part:BBa_K1104200), which is activated by ROS. One of these promoters is HemHp.
OxyR is an activator of ahpC promoter and its improvement parts. More details about OxyR can be found on the PartRegistry page: Part:BBa_K1104200.
Information of HemHp on Ecocyc
We get information of HemHp from Ecocyc,
HemHp is regulated by σ70, and there are two TFBSs upstream for OxyR.
- Reference: Ritz, D. (January 28, 2000). Thioredoxin 2 Is Involved in the Oxidative Stress Response in Escherichia coli. Journal of Biological Chemistry, 275, 4, 2505-2512.
Usage and Biology
We designed circuit fighting against Nosema ceranae. After Nosema ceranae infected midgut cells of bees, and Bee. coli should sense the pathogen first before the following circuit(fighting against Nosema ceranae)is triggered, and substance such as Defensin(Part:BBa_K1104300), Abaesin(Part:BBa_K1104301) (more details on Killing Nosema page) in the following circuit will express.
Besides, in order to enhance the strength of HemHp, we added a device (more details on Sensing Nosema page).
- Part:BBa_K1104242: HemHp+E0840, reporter with GFP for promoter testing.
- Part:BBa_K1104202: HemHp, another OxyR-induced promoter.
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12COMPATIBLE WITH RFC
- 21COMPATIBLE WITH RFC
- 23COMPATIBLE WITH RFC
- 25COMPATIBLE WITH RFC
- 1000COMPATIBLE WITH RFC