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Journal Article

Impact of methylations of m2G966/m5C967 in 16S rRNA on bacterial fitness and translation initiation.

MPS-Authors
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Burakovsky,  D. E.
Department of Physical Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Milon,  P.
Department of Physical Biochemistry, MPI for biophysical chemistry, Max Planck Society;

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Rodnina,  M. V.
Department of Physical Biochemistry, MPI for biophysical chemistry, Max Planck Society;

Fulltext (public)

1502789.pdf
(Publisher version), 5MB

Supplementary Material (public)

1502789-Suppl.pdf
(Supplementary material), 405KB

Citation

Burakovsky, D. E., Prokhorova, I. V., Sergiev, P. V., Milon, P., Sergeeva, O. V., Bogdanov, A. A., et al. (2012). Impact of methylations of m2G966/m5C967 in 16S rRNA on bacterial fitness and translation initiation. Nucleic Acids Research, 40(16), 7885-7895. doi:10.1093/nar/gks508.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-C712-E
Abstract
The functional centers of the ribosome in all organisms contain ribosomal RNA (rRNA) modifications, which are introduced by specialized enzymes and come at an energy cost for the cell. Surprisingly, none of the modifications tested so far was essential for growth and hence the functional role of modifications is largely unknown. Here, we show that the methyl groups of nucleosides m2G966 and m5C967 of 16S rRNA in Escherichia coli are important for bacterial fitness. In vitro analysis of all phases of translation suggests that the m2G966/m5C967 modifications are dispensable for elongation, termination and ribosome recycling. Rather, the modifications modulate the early stages of initiation by stabilizing the binding of fMet-tRNAfMet to the 30S pre-initiation complex prior to start-codon recognition. We propose that the m2G966 and m5C967 modifications help shaping the bacterial proteome, most likely by fine-tuning the rates that determine the fate of a given messenger RNA (mRNA) at early checkpoints of mRNA selection.