23S Methyl RNA Motif
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The 23S methyl RNA motif is a conserved
RNA Ribonucleic acid (RNA) is a polymeric molecule that is essential for most biological functions, either by performing the function itself (non-coding RNA) or by forming a template for the production of proteins (messenger RNA). RNA and deoxyrib ...
structure found
upstream Upstream may refer to: * Upstream (hydrology), the direction towards the source of a stream (against the direction of flow) * Upstream (bioprocess), part of therapeutic cell manufacturing processes from early cell isolation and cultivation until ...
of genes predicted to encode rRNA methyltransferases, possibly for 23S rRNA. However, in one case it is far (3 kilobases) from the rRNA methyltransferase gene. Nonetheless, it was proposed that this RNA could be a
cis-regulatory element ''Cis''-regulatory elements (CREs) or ''cis''-regulatory modules (CRMs) are regions of non-coding DNA which regulate the transcription of neighboring genes. CREs are vital components of genetic regulatory networks, which in turn control morpho ...
, an attractive hypothesis as rRNA methyltransferases can bind RNA, and therefore presumably the 23S methyl RNA. This regulatory strategy is common in bacteria to control levels of
ribosomal Ribosomes () are macromolecular machines, found within all cells, that perform biological protein synthesis (messenger RNA translation). Ribosomes link amino acids together in the order specified by the codons of messenger RNA molecules to fo ...
subunits, using RNA motifs called ribosomal leaders. Additionally, 23S methyl RNAs have rho-independent transcription terminators downstream, which could be a mechanism of regulation. The 23S methyl RNA is found exclusively in the order of
bacteria Bacteria (; : bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of Prokaryote, prokaryotic microorganisms. Typically a few micr ...
called
Lactobacillales Lactobacillales are an order of gram-positive, low-GC, acid-tolerant, generally nonsporulating, nonrespiring, either rod-shaped (bacilli) or spherical ( cocci) bacteria that share common metabolic and physiological characteristics. These bac ...
.


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* Cis-regulatory RNA elements {{molecular-cell-biology-stub