| Accession | ARO:3001299 |
| CARD Short Name | Sfra_tlrB_TYL |
| Definition | TlrB is a methyltransferase found in Streptomyces fradiae and confers resistance to mycinamicin, tylosin and lincosamides. Specifically, this enzyme adds a methyl group to guanosine 748 (E. coli numbering). TlrB is found in the tylosin biosynthetic cluster and is one mechanism by which S. fradiae protects itself from self-destruction when producing this macrolide. |
| AMR Gene Family | non-erm 23S ribosomal RNA methyltransferase (G748) |
| Drug Class | lincosamide antibiotic, macrolide antibiotic |
| Resistance Mechanism | antibiotic target alteration |
| Classification | 11 ontology terms | Show + process or component of antibiotic biology or chemistry + mechanism of antibiotic resistance + determinant of antibiotic resistance + antibiotic target alteration [Resistance Mechanism] + antibiotic target modifying enzyme + ribosomal alteration conferring antibiotic resistance + rRNA methyltransferase conferring antibiotic resistance + antibiotic molecule + 23S ribosomal RNA methyltransferase + lincosamide antibiotic [Drug Class] + macrolide antibiotic [Drug Class] |
| Parent Term(s) | 3 ontology terms | Show + confers_resistance_to_antibiotic tylosin [Antibiotic] + gene involved in self-resistance to antibiotic + non-erm 23S ribosomal RNA methyltransferase (G748) [AMR Gene Family] |
| Publications | Wilson VT, et al. 1999. J Antibiot (Tokyo) 52(3): 288-296. Molecular analysis of tlrB, an antibiotic-resistance gene from tylosin-producing Streptomyces fradiae, and discovery of a novel resistance mechanism. (PMID 10348045) Liu M, et al. 2000. Mol Microbiol 37(4): 811-820. The tylosin resistance gene tlrB of Streptomyces fradiae encodes a methyltransferase that targets G748 in 23S rRNA. (PMID 10972803) |
Prevalence of tlrB conferring tylosin resistance among the sequenced genomes, plasmids, and whole-genome shotgun assemblies available at NCBI or IslandViewer for 414 important pathogens (see methodological details and complete list of analyzed pathogens). Values reflect percentage of genomes, plasmids, genome islands, or whole-genome shotgun assemblies that have at least one hit to the AMR detection model. Default view includes percentages calculated based on Perfect plus Strict RGI hits. Select the checkbox to view percentages based on only Perfect matches to AMR reference sequences curated in CARD (note: this excludes resistance via mutation as references in protein variant models are often wild-type, sensitive sequences).
| Species | NCBI Chromosome | NCBI Plasmid | NCBI WGS | NCBI GI | GRDI-AMR2 |
|---|---|---|---|---|---|
| No prevalence data | |||||
Model Type: protein homolog model
Model Definition: Protein Homolog Models (PHM) detect protein sequences based on their similarity to a curated reference sequence, using curated BLASTP bitscore cut-offs. Protein Homolog Models apply to all genes that confer resistance through their presence in an organism, such as the presence of a beta-lactamase gene on a plasmid. PHMs include a reference sequence and a bitscore cut-off for detection using BLASTP. A Perfect RGI match is 100% identical to the reference protein sequence along its entire length, a Strict RGI match is not identical but the bit-score of the matched sequence is greater than the curated BLASTP bit-score cutoff, Loose RGI matches have a bit-score less than the curated BLASTP bit-score cut-off.
Bit-score Cut-off (blastP): 500
| Curator | Description | Most Recent Edit |
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