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Signal recognition particle (SRP)‐dependent protein targeting is a universally conserved process that delivers proteins to the bacterial cytoplasmic membrane or to the endoplasmic reticulum membrane in eukaryotes. Crucial during targeting is the transfer of the ribosome‐nascent chain complex (RNC) from SRP to the Sec translocon. In eukaryotes, this step is co‐ordinated by the SRβ subunit of the SRP...
Different from eukaryotes, the bacterial signal recognition particle (SRP) receptor lacks a membrane-tethering SRP receptor (SR) β subunit and is composed of only the SRα homologue FtsY. FtsY is a modular protein composed of three domains. The N- and G-domains of FtsY are highly similar to the corresponding domains of Ffh/SRP54 and SRα and constitute the essential core of FtsY. In contrast, the weakly...
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