| Accession | ARO:3003794 |
| Synonym(s) | vicK yycG |
| CARD Short Name | Saur_walK_DAP |
| Definition | walK is the histidine kinase sensor of a two-component regulatory system controlling peptidoglycan metabolism through regulation of the expression of most of the peptidoglycan hydrolase genes. Mutations in the gene have been found that confer daptomycin resistance. |
| AMR Gene Family | daptomycin resistant walK |
| Drug Class | peptide antibiotic |
| Resistance Mechanism | antibiotic target alteration |
| Resistomes with Sequence Variants | Staphylococcus aureusg+wgs |
| Classification | 10 ontology terms | Show + process or component of antibiotic biology or chemistry + antibiotic molecule + mechanism of antibiotic resistance + peptide antibiotic [Drug Class] + antibiotic target alteration [Resistance Mechanism] + mutation conferring antibiotic resistance + lipopeptide antibiotic + determinant of antibiotic resistance + daptomycin [Antibiotic] + antibiotic resistant gene variant or mutant |
| Parent Term(s) | 2 ontology terms | Show + confers_resistance_to_antibiotic daptomycin [Antibiotic] + daptomycin resistant walK [AMR Gene Family] |
| Publications | Song Y, et al. 2013. PLoS One 8(3): E58469. Additional routes to Staphylococcus aureus daptomycin resistance as revealed by comparative genome sequencing, transcriptional profiling, and phenotypic studies. (PMID 23554895) Friedman L, et al. 2006. Antimicrob Agents Chemother 50(6): 2137-2145. Genetic changes that correlate with reduced susceptibility to daptomycin in Staphylococcus aureus. (PMID 16723576) |
Prevalence of Staphylococcus aureus walK with mutation conferring resistance to daptomycin 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 |
|---|---|---|---|---|
| Staphylococcus aureus | 0.17% | 0% | 0.01% | 0% |
Model Type: protein variant model
Model Definition: Protein Variant Models (PVM) perform a similar search as Protein Homolog Models (PHM), i.e. detect protein sequences based on their similarity to a curated reference sequence, but secondarily screen query sequences for curated sets of mutations to differentiate them from antibiotic susceptible wild-type alleles. PVMs are designed to detect AMR acquired via mutation of house-keeping genes or antibiotic targets, e.g. a mutated gyrase resistant to aminocoumarin antibiotics. PVMs include a protein reference sequence (often from antibiotic susceptible wild-type alleles), a curated bit-score cut-off, and mapped resistance variants. Mapped resistance variants may include any or all of single point mutations, insertions, or deletions curated from the scientific literature. A Strict RGI match has a BLASTP bit-score above the curated BLASTP cutoff value and contains at least one curated mutation from amongst the mapped resistance variants, while a Loose RGI match has a bit-score less than the curated BLASTP bit-score cut-off but still contains at least one curated mutation from amongst the mapped resistance variants.
Bit-score Cut-off (blastP): 1150
Legend:
Published Variants:
| PMID: 23554895 | L10F |
| PMID: 16723576 | S221P R263C |