The signal recognition particle (SRP) has evolved in chloroplasts to include new components, new ways of recognizing targeting substrates and new capabilities that prevent aggregation of protein-targeting substrates or even rescue substrates from an aggregated conformation. Unique attributes of chloroplast SRP are focused toward localizing a single family of nuclear-encoded chlorophyll-binding proteins to thylakoid membranes and suggest that the successful migration of this gene family to the nucleus was tied to evolutionary adaptations in chloroplast SRP.
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Work in the author's laboratory is supported by US Department of Energy grant DE-FG02-01ER15161 and US National Center for Research Resources grant P20 RR15569.
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Henry, R. SRP: adapting to life in the chloroplast. Nat Struct Mol Biol 17, 676–677 (2010). https://doi.org/10.1038/nsmb0610-676
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DOI: https://doi.org/10.1038/nsmb0610-676