YF1 works in conjunction with its response regulator, FixJ. This part consists of RBS-coupled YF1 and FixJ without promoter.
Notes
This constructs Strong RBS to ensure good expression.
Source
The components that made up of YF1 fusion protein comes from Bradyrhizobium japonicum and Bacillus subtilis. FixJ comes from the genome of Bradyrhizobium japonicum.