rrnC

rrnC is a ribosomal RNA operon designation used in bacterial genome annotations to refer to one of multiple rRNA gene clusters. rrn operons typically consist of sequential genes encoding 16S rRNA, 23S rRNA, and 5S rRNA, often arranged with internal transcribed spacers and sometimes with tRNA genes. The specific arrangement varies among species, and the rrnC operon is one member among several such operons in a genome; in Escherichia coli K-12, for example, there are seven rrn operons named rrnA, rrnB, rrnC, rrnD, rrnE, rrnG, and rrnH.

Location and copy number are genome-specific; some bacteria carry a single rrn operon while others have multiple copies, which can influence growth rate and ribosome production.

Each rrn operon contains the 16S, 23S, and 5S rRNA genes; transcription by RNA polymerase yields the components of the small and large ribosomal subunits after processing.

In research, the 16S rRNA gene within rrnC is used in taxonomy and microbial community profiling; rrn operon copy number can affect quantitative estimates in metagenomics.

Note: The exact sequence and coordinates of rrnC vary by organism; consult organism-specific genome annotations for precise information.