Identification of Chloroplast Signal Recognition Particle RNA Genes

摘要: The signal recognition particle (SRP) is a ribonucleoprotein complex responsible for targeting proteins to the ER membrane in eukaryotes, plasma bacteria and thylakoid chloroplasts. In higher plants two different SRP-dependent mechanisms have been identified: one post-translational imported chloroplast co-translational encoded by plastid genome. SRP (cpSRP) consists of protein subunits cpSRP54 cpSRP43. An RNA component has not identified does seem be required cpSRP. mechanism known involve cpSRP54, but an yet identified. Several genomes sequenced recently, making phylogenetically broad computational search cpSRP possible. We analysed from 27 organisms. plant chloroplasts, no genes were However, eight plastids red algae Chlorophyta found contain gene. These results suggest that forms these with reminiscent eubacterial SRP.