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. 1995 Nov 7;92(23):10555–10559. doi: 10.1073/pnas.92.23.10555

Genetic and comparative analyses reveal an alternative secondary structure in the region of nt 912 of Escherichia coli 16S rRNA.

J S Lodmell 1, R R Gutell 1, A E Dahlberg 1
PMCID: PMC40650  PMID: 7479839

Abstract

Mutations at position 912 of Escherichia coli 16S rRNA result in two notable phenotypes. The C-->U transition confers resistance to streptomycin, a translational-error-inducing antibiotic, while a C-->G transversion causes marked retardation of cell growth rate. Starting with the slow-growing G912 mutant, random mutagenesis was used to isolate a second site mutation that restored growth nearly to the wild-type rate. The second site mutation was identified as a G-->C transversion at position 885 in 16S rRNA. Cells containing the G912 mutation had an increased doubling time, abnormal sucrose gradient ribosome/subunit profile, increased sensitivity to spectinomycin, dependence upon streptomycin for growth in the presence of spectinomycin, and slower translation rate, whereas cells with the G912/C885 double mutation were similar to wild type in these assays. Comparative analysis showed there was significant covariation between positions 912 and 885. Thus the second-site suppressor analysis, the functional assays, and the comparative data suggest that the interaction between nt 912 and nt 885 is conserved and necessary for normal ribosome function. Furthermore, the comparative data suggest that the interaction extends to include G885-G886-G887 pairing with C912-U911-C910. An alternative secondary structure element for the central domain of 16S rRNA is proposed.

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Selected References

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