Accession ARO:3001300
CARD Short NamemyrA
DefinitionmyrA is a methyltransferase found in Micromonospora griseorubida and confers resistance to mycinamicin and tylosin. Specifically, this enzyme adds a methyl group to guanosine 748 (E. coli numbering) of 23S ribosomal RNA. MyrA is found in the mycinamicin biosynthetic cluster and is one mechanism by which M. griseorubida protects itself from self-destruction when producing this macrolide.
AMR Gene Familynon-erm 23S ribosomal RNA methyltransferase (G748)
Drug Classlincosamide antibiotic, macrolide antibiotic
Resistance Mechanismantibiotic target alteration
Classification11 ontology terms | Show
Parent Term(s)4 ontology terms | Show
+ non-erm 23S ribosomal RNA methyltransferase (G748) [AMR Gene Family]
+ gene involved in self-resistance to antibiotic
+ confers_resistance_to_antibiotic mycinamicin [Antibiotic]
+ confers_resistance_to_antibiotic tylosin [Antibiotic]

Liu M, et al. 2002. Proc Natl Acad Sci U S A 99(23): 14658-14663. Resistance to the macrolide antibiotic tylosin is conferred by single methylations at 23S rRNA nucleotides G748 and A2058 acting in synergy. (PMID 12417742)

Inouye M, et al. 1994. Gene 141(1): 39-46. Cloning and sequences of two macrolide-resistance-encoding genes from mycinamicin-producing Micromonospora griseorubida. (PMID 8163173)


Prevalence of myrA among the sequenced genomes, plasmids, and whole-genome shotgun assemblies available at NCBI or IslandViewer for 413 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).

Prevalence: protein homolog model

SpeciesNCBI ChromosomeNCBI PlasmidNCBI WGSNCBI GI
No prevalence data

Detection Models

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): 525

>gb|BAA03674.1|+|myrA [Micromonospora griseorubida]

>gb|D16099.1|+|410-1297|myrA [Micromonospora griseorubida]