[No authors listed]
The signal recognition particle (SRP) receptor is a major player in the pathway of membrane protein biogenesis in all organisms. The receptor functions as a membrane-bound entity but very little is known about its targeting to the membrane. Here, we demonstrate in vivo that the Escherichia coli SRP receptor targets the membrane co-translationally. This requires emergence from the ribosome of the four-helix-long N-domain of the receptor, of which only helices 2-4 are required for co-translational membrane attachment. The results also suggest that the targeting might be regulated co-translationally. Taken together, our in vivo studies shed light on the biogenesis of the SRP receptor and its hypothetical role in targeting ribosomes to the E. coli membrane.
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