| Accession | ARO:3000027 |
| CARD Short Name | emrA |
| Definition | EmrA is a membrane fusion protein, providing an efflux pathway with EmrB and TolC between the inner and outer membranes of E. coli, a Gram-negative bacterium. |
| AMR Gene Family | major facilitator superfamily (MFS) antibiotic efflux pump |
| Drug Class | fluoroquinolone antibiotic |
| Resistance Mechanism | antibiotic efflux |
| Efflux Component | efflux pump complex or subunit conferring antibiotic resistance |
| Resistomes with Perfect Matches | Escherichia colig+wgs, Shigella boydiiwgs, Shigella flexnerig+wgs, Shigella sonneiwgs |
| Resistomes with Sequence Variants | Citrobacter portucalensiswgs, Escherichia albertiig+wgs, Escherichia colig+p+wgs, Escherichia fergusoniig+wgs, Escherichia marmotaeg+wgs, Salmonella bongorig+wgs, Salmonella entericag+p+wgs, Shigella boydiig+wgs, Shigella dysenteriaeg+wgs, Shigella flexnerig+wgs, Shigella sonneig+wgs |
| Classification | 9 ontology terms | Show + process or component of antibiotic biology or chemistry + mechanism of antibiotic resistance + determinant of antibiotic resistance + antibiotic molecule + antibiotic efflux [Resistance Mechanism] + efflux pump complex or subunit conferring antibiotic resistance [Efflux Component] + fluoroquinolone antibiotic [Drug Class] + nalidixic acid [Antibiotic] + major facilitator superfamily (MFS) antibiotic efflux pump [AMR Gene Family] |
| Parent Term(s) | 2 ontology terms | Show |
| Publications | Lomovskaya O, et al. 1995. J Bacteriol 177(9): 2328-2334. EmrR is a negative regulator of the Escherichia coli multidrug resistance pump EmrAB. (PMID 7730261) |
Prevalence of emrA 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 |
|---|---|---|---|---|---|
| Citrobacter portucalensis | 0% | 0% | 1.8% | 0% | 0% |
| Escherichia albertii | 97.14% | 0% | 98.06% | 0% | 0% |
| Escherichia coli | 67.46% | 0.01% | 99.02% | 0% | 99.47% |
| Escherichia fergusonii | 100% | 0% | 98.91% | 0% | 0% |
| Escherichia marmotae | 100% | 0% | 95.83% | 0% | 0% |
| Salmonella bongori | 100% | 0% | 89.47% | 0% | 0% |
| Salmonella enterica | 11.29% | 0.05% | 17.38% | 0% | 0% |
| Shigella boydii | 93.33% | 0% | 96.67% | 0% | 0% |
| Shigella dysenteriae | 100% | 0% | 100% | 0% | 0% |
| Shigella flexneri | 37% | 0% | 4.04% | 0% | 0% |
| Shigella sonnei | 100% | 0% | 99.42% | 0% | 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): 675
| Curator | Description | Most Recent Edit |
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