An rRNA operon is a genetic locus that controls the transcription of ribosomal RNA in bacterial operons. They are referred to as rrnB, rrnC, rrnD, etc., depending on the structural position of the transcription unit in the DNA sequence.
rRNA-Operon
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The RNA operon theory states that mRNAs originating from different chromosomes assemble into ribonucleoprotein particles (RNPs) that act as functional operons to generate protein cohorts during cotranslation.
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It is generally assumed that all bacteria carry at least one rRNA operon (rrn operon ) on the chromosome. However, some strains of the genera Aureimonas and Oecophyllibacter carry their only rrn operon on a plasmid.