PMID:2644257: Difference between revisions
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|{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2644257 PubMed] | |{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2644257 PubMed] | ||
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Revision as of 22:41, 25 April 2008
Roberts, MW and Rabinowitz, JC (1989) The effect of Escherichia coli ribosomal protein S1 on the translational specificity of bacterial ribosomes.J. Biol. Chem. 264:2228-35
| Abstract | Ribosomes from Gram-negative bacteria such as Escherichia coli exhibit non-specific translation of bacterial mRNAs. That is, they are able to translate mRNAs from a variety of sources in a manner independent of the "strength" of the Shine-Dalgarno region, in contrast to ribosomes from many Gram-positive bacteria, such as Bacillus subtilis, which show specific translation in only being able to translate other Gram-positive mRNA, or mRNAs that have "strong" Shine-Dalgarno regions. There is an evolutionary correlation between the translational specificity and the absence of a protein analogous to E. coli ribosomal protein S1. The specificity observed with B. subtilis ribosomes is a function of their 30 S subunit which lacks S1; translation of Gram-negative mRNA can occur with heterologous ribosomes containing the 30 S subunit of E. coli ribosomes and the 50 S subunit of B. subtilis ribosomes. However, the addition of E. coli S1 alone to B. subtilis ribosome does not overcome their characteristic inability to translate mRNA from Gram-negative organisms. By contrast, the removal of S1 from E. coli ribosomes results in translational behavior similar to that shown by B. subtilis ribosomes in that the S1-depleted E. coli ribosomes can translate mRNA from Gram-positive sources in the absence of added S1, although addition of S1 stimulates further translation of such mRNAs by the E. coli ribosomes. |
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