| Accession | ARO:3000347 |
| Synonym(s) | ermTR |
| CARD Short Name | ErmA |
| Definition | ErmA confers the MLSb phenotype. Similar to ErmC, Expression of ErmA is inducible by erythromycin. The leader peptide causes attenuation of the mRNA and stabilizes the structure preventing further translation. When erythromycin is present, it binds the leader peptide causing a change in conformation allowing for the expression of ErmA. |
| AMR Gene Family | Erm 23S ribosomal RNA methyltransferase |
| Drug Class | streptogramin antibiotic, streptogramin B antibiotic, streptogramin A antibiotic, lincosamide antibiotic, macrolide antibiotic |
| Resistance Mechanism | antibiotic target alteration |
| Resistomes with Perfect Matches | Enterococcus aviumg+wgs, Enterococcus faecaliswgs, Enterococcus faeciumg+p+wgs+gi, Staphylococcus aureusg+wgs+gi, Staphylococcus capitisg+wgs, Staphylococcus epidermidisg+wgs+gi, Staphylococcus haemolyticusg+wgs, Staphylococcus hominiswgs, Staphylococcus lugdunensisg+wgs, Staphylococcus pseudintermediusg, Staphylococcus simulanswgs |
| Resistomes with Sequence Variants | Campylobacter colig+wgs, Clostridium perfringensp+wgs, Enterococcus aviumg+wgs, Enterococcus faecalisg+p+wgs+gi, Enterococcus faeciumg+p+wgs+gi, Enterococcus hiraewgs, Lactobacillus crispatusg+wgs, Lactococcus garvieaep, Listeria innocuag, Staphylococcus aureusg+wgs+gi, Staphylococcus capitisg+wgs, Staphylococcus epidermidisg+wgs+gi, Staphylococcus haemolyticusg+wgs, Staphylococcus hominiswgs, Staphylococcus lugdunensisg+wgs, Staphylococcus pseudintermediusg, Staphylococcus simulansg+wgs, Streptococcus gallolyticuswgs, Streptococcus suisg+wgs |
| Classification | 14 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 + antibiotic molecule + rRNA methyltransferase conferring antibiotic resistance + streptogramin antibiotic [Drug Class] + 23S ribosomal RNA methyltransferase + streptogramin B antibiotic [Drug Class] + streptogramin A antibiotic [Drug Class] + lincosamide antibiotic [Drug Class] + macrolide antibiotic [Drug Class] |
| Parent Term(s) | 25 ontology terms | Show + confers_resistance_to_antibiotic erythromycin [Antibiotic] + confers_resistance_to_antibiotic roxithromycin [Antibiotic] + confers_resistance_to_antibiotic lincomycin [Antibiotic] + confers_resistance_to_antibiotic telithromycin [Antibiotic] + confers_resistance_to_antibiotic clarithromycin [Antibiotic] + confers_resistance_to_antibiotic clindamycin [Antibiotic] + confers_resistance_to_antibiotic tylosin [Antibiotic] + confers_resistance_to_antibiotic spiramycin [Antibiotic] + confers_resistance_to_antibiotic azithromycin [Antibiotic] + confers_resistance_to_antibiotic dirithromycin [Antibiotic] + Erm 23S ribosomal RNA methyltransferase [AMR Gene Family] + confers_resistance_to_antibiotic pristinamycin IA [Antibiotic] + confers_resistance_to_antibiotic quinupristin [Antibiotic] + confers_resistance_to_antibiotic virginiamycin M1 [Antibiotic] + confers_resistance_to_antibiotic madumycin II [Antibiotic] + confers_resistance_to_antibiotic griseoviridin [Antibiotic] + confers_resistance_to_antibiotic dalfopristin [Antibiotic] + confers_resistance_to_antibiotic pristinamycin IB [Antibiotic] + confers_resistance_to_antibiotic virginiamycin S2 [Antibiotic] + confers_resistance_to_antibiotic pristinamycin IC [Antibiotic] + confers_resistance_to_antibiotic vernamycin C [Antibiotic] + confers_resistance_to_antibiotic patricin A [Antibiotic] + confers_resistance_to_antibiotic patricin B [Antibiotic] + confers_resistance_to_antibiotic ostreogrycin B3 [Antibiotic] + confers_resistance_to_antibiotic oleandomycin [Antibiotic] |
| Publications | Malhotra-Kumar S, et al. 2008. J Antimicrob Chemother 63(1): 42-46. Unusual resistance patterns in macrolide-resistant Streptococcus pyogenes harbouring erm(A). (PMID 18952616) |
Prevalence of ErmA 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).
| Species | NCBI Chromosome | NCBI Plasmid | NCBI WGS | NCBI GI |
|---|---|---|---|---|
| Campylobacter coli | 1.45% | 0% | 0.18% | 0% |
| Clostridium perfringens | 0% | 1.93% | 0.49% | 0% |
| Enterococcus avium | 33.33% | 0% | 15.79% | 0% |
| Enterococcus faecalis | 7.27% | 7.64% | 3.2% | 8.33% |
| Enterococcus faecium | 4.46% | 1.49% | 6.11% | 3.92% |
| Enterococcus hirae | 0% | 0% | 2.31% | 0% |
| Lactobacillus crispatus | 4% | 0% | 0.27% | 0% |
| Lactococcus garvieae | 0% | 4.17% | 0% | 0% |
| Listeria innocua | 5.88% | 0% | 0% | 0% |
| Staphylococcus aureus | 17.1% | 0% | 12.75% | 23.5% |
| Staphylococcus capitis | 30% | 0% | 12.66% | 0% |
| Staphylococcus epidermidis | 6.45% | 0% | 1.92% | 8.57% |
| Staphylococcus haemolyticus | 3.45% | 0% | 1.98% | 0% |
| Staphylococcus hominis | 0% | 0% | 0.98% | 0% |
| Staphylococcus lugdunensis | 5.56% | 0% | 1.54% | 0% |
| Staphylococcus pseudintermedius | 3.33% | 0% | 0% | 0% |
| Staphylococcus simulans | 5% | 0% | 6.78% | 0% |
| Streptococcus gallolyticus | 0% | 0% | 4.55% | 0% |
| Streptococcus suis | 8% | 0% | 2.36% | 0% |
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): 400