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. 1977 Jan;4(1):1–15. doi: 10.1093/nar/4.1.1

Differential requirements for polypeptide chain initiation complex formation at the three bacteriophage R17 initiator regions.

J A Steitz, A J Wahba, M Laughrea, P B Moore
PMCID: PMC342405  PMID: 325516

Abstract

The initiation specificity of washed E. coli ribosomes in the presence and absence of purified initiation factors and/or S1 protein has been examined in protection experiments using 32P-labelled R17 RNA. We find that the three bacteriophage initiator regions do not exhibit equal requirements for either of these components during initiation complex formation. Specifically, both factors and S1 stimulate ribosome binding to the beginnings of the coat and replicase cistrons to a greater extent than they promote recognition of the A protein initiation site. The differential effects are therefore inversely correlated with the degree of mRNA-16S rRNA complementarity exhibited by the three initiator regions. We also observe that S1 suppresses ribosome binding to spurious sites in the R17 RNA.

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Selected References

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