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The export of β-lactamase to the periplasm of Escherichia coli can be directed by the OmpA signal peptide in the secretion cloning vector pIN-III. The overproduction of the hybrid precursor specifically induces a delay in the onset of processing of newly synthesized polypeptide chains. However, when the processing starts, no alteration in the rate of cleavage itself is observed. Our results suggest...
The accumulation of pre-PhoS under conditions of PhoS overproduction has been previously described. It is now demonstrated that during the induction of PhoS, a delay in the completion of polypeptide chain elongation can be detected. This delay is related to the extent of jamming of export sites by pre-PhoS or by other exported proteins. These results suggest that a component required for completion...
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