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The signal recognition particle (SRP) is a phylogenetically conserved ribonucleoprotein that associates with ribosomes to mediate the targeting of membrane and secretory proteins to biological membranes. In higher eukaryotes, SRP biogenesis involves the sequential binding of SRP19 and SRP54 proteins to the S domain of 7S RNA. The recently determined crystal structures of SRP19 in complex with the...
Background: Bacterial signal recognition particle (SRP), consisting of 4.5S RNA and Ffh protein, plays an essential role in targeting signal-peptide-containing proteins to the secretory apparatus in the cell membrane. The 4.5S RNA increases the affinity of Ffh for signal peptides and is essential for the interaction between SRP and its receptor, protein FtsY. The 4.5S RNA also interacts with elongation...
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