confers_resistance_to_drug_class derives_from confers_resistance_to_drug_class rifamycin antibiotic antibiotic sensitive aftA antibiotic resistant aftA rifamycin-resistant arabinosyltransferase antibiotic_resistance ARO:3003464 Arabinosyl transferases allow for the polymerization of arabinose to form arabinan. Arabanan is required for formation of mycobacterial cell walls and arabinosyltransferases are targets of the drug ethambutol. Mutations in these genes can confer resistance to rifampicin.