How proteins are targeted and translocated mediated by signal recognition particle (SRP) in eukaryotic cell is very clear and uniform. In contrast, SRP systems are different in various kinds of prokaryotic cells, So it is difficult to identify. Nowadays, the studies of prokaryotic SRP system focus on the structure and function of Ffh, FtsY, 4.5S RNA, and GTP as a regulating molecular. Here, a description was given on research progress of constitutes, structures and functions of bacterial SRP complex proteins. The research status of streptomyces SRP pathway was also reviewed, and this study in streptomyces will be helpful to explain the molecular mechanism of prokaryotic SRP system.
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