The Bacillaceae-1 RNA motif comprises two distinct classes.

Area of Science:

• Bacterial molecular biology
• RNA structure and function
• Genomics

Background:

• Non-coding RNAs regulate bacterial processes, but many lack defined functions.
• The Bacillaceae-1 RNA motif is a computationally predicted element with unknown roles.

Purpose of the Study:

• To investigate the functional characteristics of the Bacillaceae-1 RNA motif.
• To determine the structural diversity and genomic context of Bacillaceae-1 RNA.
• To analyze expression patterns of Bacillaceae-1 RNA in Bacillus subtilis.

Main Methods:

• Bioinformatic analysis of 118 Bacillaceae-1 RNA motif occurrences across 11 Bacillus species.
• Assessment of RNA secondary structure ensemble diversity.
• Examination of genomic context, particularly proximity to ribosomal RNA (rRNA) genes.
• Analysis of public gene expression data for Bacillus subtilis.

Main Results:

• The Bacillaceae-1 RNA motif is more conserved in non-pathogenic than pathogenic Bacillus strains.
• Two distinct classes of the motif were identified based on structural diversity and genomic location.
• Motifs near 16S rRNA genes exhibit stable structures, with reverse complements expressed alongside rRNA.
• Intergenic motifs show higher structural diversity and potential for structural switching.

Conclusions:

• Bacillaceae-1 RNA motifs associated with rRNA clusters likely function with a stable structure and expressed reverse complement.
• A subset of intergenic Bacillaceae-1 RNA motifs may possess regulatory roles through structural plasticity.
• The study provides insights into the functional divergence of a bacterial non-coding RNA motif.