Difference between revisions of "Part:BBa C0071"

Revision as of 04:41, 16 October 2016

rhlR repressor/activator from P. aeruginosa PA3477 (+LVA)

Transcriptional regulator, in complex with N-butyryl-HSL, RhlR binds to the Rhl promoter

Usage and Biology

Transcriptional regulator, binds with N-butyryl-HSL

Characterization

Group: Tokyo Tech 2016

Author: Yoshio Takata

We simulated our final genetic circuits and found that the circuits did not work, because Prhl activity was too weak compared to Plux. (see the Modeling page and the Only Assay page). We therefore considered using the improved Prhl (BBa_K1529310, BBa_K1529300) established by Tokyo_Tech 2014, but we noticed that they were inappropriate for two reasons (see the Discussion). Then, we decided to improve Prhl Promoter and obtain our original improved Prhl (Noticeable Mutant) (BBa_K1949060), hereafter referred to as Prhl(NM), that suited our goal.

During improving Prhl(R0071), we characterize this part. So, we describe that characterization.

We found that Prhl(RL) (BBa_K1529300) activity was weak and the expression level depended on LVA tag (Fig.1); LVA-tagged proteins are prone to be degraded by cellular proteases. Prhl(LR) (BBa_K1529310) activity was strong and unexpectedly reacted with C12 (crosstalk) (Fig.3).

Fig.1 Comparison of the Past improved Prhl and RhlR

The colonies of transformants with a rhlR (BBa_C0171) plasmid looked rough and the growth rate was low(Fig.2-left), while the colonies of transformants with a rhlR-LVA (BBa_C0071) plasmid looked smooth and the growth rate was normal(Fig.2-right). However, the reason for this result is unclear.

Fig.2 The colonies of transformants with a rhlR (left) or a rhlR-LVA right

Sequence and Features