Chloroplast Two-Component Systems: Evolution of the Link between Photosynthesis and Gene Expression

Two-Component Systems Enter the Eukaryotic Domain of Life e name ‘two-component system’ is used to describe members of a class of signal transduction pathways found in eubacteria and made up of two conserved protein components (Stock et al. 1985; Nixon et al. 1986). ese two conserved protein components are a sensor kinase and a response regulator (gure 1).