Toll-like receptors (TLRs) detect microbial infections and trigger innate immune responses. Among vertebrate TLRs, the role of TLR13 and its ligand are unknown. Here we show that TLR13 detects the 23S ribosomal RNA of both gram-positive and gram-negative bacteria. A sequence containing 13 nucleotides near the active site of 23S rRNA ribozyme, which catalyzes peptide bond synthesis, was both nec...

Discrimination of Staphylococcus aureus strains, isolated from camel abscesses and mastitic milk of camel, cattle and goats, on the basis of 16S-23S ribosomal RNA intergenic space polymorphism was carried out. Two sets of primers were used for amplification of DNA of intergenic space; the one having a highly conserved sequence in eubacterial 23S rRNA transcript, while the other having less cons...

Ribosomal genes are strongly regulated dependent on growth phase in all organisms, but this regulation is poorly understood in Archaea. Moreover, very little is known about growth phase-dependent gene regulation in Archaea. SSV1-based lacS reporter gene constructs containing the Sulfolobus 16S/23S rRNA gene core promoter, the TF55α core promoter, or the native lacS promoter were tested in Sulfo...

Macrolides are an important tool in the treatment of Mycobacterium avium complex infections. Here, we evaluate the use of 23S rRNA gene sequencing for the rapid detection of macrolide resistance. Routine sequencing of the 23S rRNA gene is highly specific for macrolide resistance but lacks in sensitivity.

We describe 2 cases of pneumonia caused by the same macrolide-resistant Mycoplasma pneumoniae in siblings. M. pneumoniae was identified using real-time PCR. Direct sequence analysis of the 23S rRNA gene revealed a point mutation in V domain (A2063G) of the 23S rRNA gene.

For six clinical isolates of Chlamydia trachomatis, in vitro susceptibility to erythromycin, azithromycin, and josamycin has been determined. Four isolates were resistant to all the antibiotics and had the mutations A2058C and T2611C (Escherichia coli numbering) in the 23S rRNA gene. All the isolates had mixed populations of bacteria that did and did not carry 23S rRNA gene mutations.

A mutation affording low levels of erythromycin resistance has been obtained by in vitro hydroxylamine mutagenesis of a cloned ribosomal RNA operon from Escherichia coli. The site of the mutational event responsible for antibiotic resistance was localized to the gene region encoding domain II of 23S rRNA by replacement of restriction fragments in the wild-type plasmid by corresponding fragments...

Our group is interested in the intersubunit bridge region of the ribosome, which involves interactions between the 16S and 23S rRNAs. The 16S rRNA makes contacts with 23S rRNA through the A site, which is also an important site for tRNA binding and a known target site for aminoglycoside antibiotics. The 23S rRNA contacts 16S rRNA through helix 69 (H69), which also interacts with the Aand the P-...