Difference between revisions of "Part:BBa K1065302"

Revision as of 15:50, 23 September 2013

Blue light sensing device without inverter for the production of amilGFP

This part consists of a Blue light sensor device, Bba_k952003 that was improved by 2013 UNITN-Trento iGEM team with an RBS sequence. When blue light (470 nm) is present production of the reporter amilGFP is inhibited. In the dark the device is activated. Everything is under the control of a constitutive promoter pLac.
This part was cloned, improved and successfully characterized by UNITN-Trento 2013 iGEM team in order to test protein transcription and then add an ethylene forming enzyme (EFE) after amilGFP.
Unlike Bba_K1065310, we built this part to have Ethylene production in the dark. The purpose is to demonstrate that the presence of the inverter cassette in Bba_K1065310 could be one of the reasons of the imperfect behavior of the switch.
The part used is from 2012 Columbia-Cooper-NYC iGEM team.

SAFETY NOTES: this part does not have safety concerns.

Usage and Biology

YF1, the blue light sensor, is a fusion protein of the LOV blue light sensor domain of Bacillus subtilis (YtvA) and FixL histidine kinase domain (from Bradyrhizobium japonicum).
In the dark, the autophosphorylated YF1 phosphorylates FixJ, its Response Regulator, which activates the pFixK2 promoter allowing amilGFP transcription.
Under constant illumination with blue light net kinase activity is strongly suppressed, consisting in a consequent inactivation of pFixK2: amilGFP is no longer produced.
The functioning of the device is due to the presence of an RBS inserted after pFixK2, that was missing in the original part. We characterized this part in E. coli using cells NEB10b.