PlsiR (Promoter of light and stress integrating response Regulator)
This promoter is part of a two-component system (TCS) originally coming from the unicellular cyanobacterium Synechocystis sp. PCC6803. Like most TCS, the system comprises a transmembrane histidine kinase sensor - UirS (K1725410); a cytoplasmic response regulator - UirR (K1725420); and an output promoter - LsiR (this part, K1725400).
The promoter is normally off and activated in response to UV-A by the release of UirR (K1725420) from the transmembrane protein UirS (K1725410) and binding at the operator region within the promoter LsiR. UirS activation is photoreversible, flipped from the ground state into an activated state when irradiated by UV-A (in the range of 382nm-405nm) and inactivated when exposed to green light (lambda = 534nm).
Prabha Ramakrishnan and Jeffrey J. Tabor (2016) showed that in the absence of green light, sfGFP (downstream of PcsiR) followed an activating Hill-like response with increasing UV-violet intensity up to 12umol m^-2 s^-1 while varying intensities of green light decreased the binding sensitivity of UirR and UirS.
For the promoter to be activated all three parts must be present and the cell has to be exposed to UV-A.
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12COMPATIBLE WITH RFC
- 21COMPATIBLE WITH RFC
- 23COMPATIBLE WITH RFC
- 25COMPATIBLE WITH RFC
- 1000Illegal BsaI site found at 456