| Accession | ARO:3007019 |
| CARD Short Name | fexB |
| Definition | FexB is a plasmid-encoded exporter gene which confers resistance to florfenicol. Originally identified in Enterococcus sp. isolated from swine by Liu et al. 2012. |
| AMR Gene Family | major facilitator superfamily (MFS) antibiotic efflux pump |
| Drug Class | phenicol antibiotic |
| Resistance Mechanism | antibiotic efflux |
| Efflux Component | efflux pump complex or subunit conferring antibiotic resistance |
| Resistomes with Perfect Matches | Enterococcus faecalisg+p+wgs, Enterococcus faeciump+wgs, Enterococcus hiraep+wgs, Staphylococcus aureusg+wgs |
| Resistomes with Sequence Variants | Enterococcus faecalisg+p+wgs, Enterococcus faeciump+wgs, Enterococcus hiraep+wgs, Staphylococcus arlettaewgs, Staphylococcus aureusg+p+wgs, Staphylococcus saprophyticuswgs |
| Classification | 7 ontology terms | Show + process or component of antibiotic biology or chemistry + mechanism of antibiotic resistance + antibiotic molecule + determinant of antibiotic resistance + antibiotic efflux [Resistance Mechanism] + efflux pump complex or subunit conferring antibiotic resistance [Efflux Component] + phenicol antibiotic [Drug Class] |
| Parent Term(s) | 2 ontology terms | Show + major facilitator superfamily (MFS) antibiotic efflux pump [AMR Gene Family] + confers_resistance_to_antibiotic florfenicol [Antibiotic] |
| Publications | Liu H, et al. 2012. J Antimicrob Chemother 67(2):322-5 A novel phenicol exporter gene, fexB, found in enterococci of animal origin. (PMID 22096043) |
Prevalence of fexB 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 |
|---|---|---|---|---|
| Enterococcus faecalis | 3.18% | 0.99% | 0.41% | 0% |
| Enterococcus faecium | 0% | 2.53% | 0.95% | 0% |
| Enterococcus hirae | 0% | 11.9% | 2.31% | 0% |
| Staphylococcus arlettae | 0% | 0% | 7.5% | 0% |
| Staphylococcus aureus | 0.09% | 0.04% | 0.06% | 0% |
| Staphylococcus saprophyticus | 0% | 0% | 0.7% | 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): 520