Wichelhaus T A, Schäfer V, Brade V, Böddinghaus B
Institute of Medical Microbiology, University Hospital of Frankfurt, Frankfurt am Main, Germany.
Antimicrob Agents Chemother. 1999 Nov;43(11):2813-6. doi: 10.1128/AAC.43.11.2813.
Mutations of the rpoB gene conferring resistance to rifampin were analyzed in 40 methicillin-resistant Staphylococcus aureus isolates obtained from six countries. Interestingly, the majority of clinical isolates showed multiple mutations within rpoB. The amino acid substitution 481His-->Asn was the most prevalent one, capable of conferring low-level resistance on its own. Cross-resistance to rifampin, rifabutin, and rifapentine was demonstrated for all mutants identified. The level of resistance to rifamycins correlated with both the mutation position and type of amino acid substitution.
对从六个国家获得的40株耐甲氧西林金黄色葡萄球菌分离株中赋予利福平抗性的rpoB基因突变进行了分析。有趣的是，大多数临床分离株在rpoB基因内显示出多个突变。氨基酸取代481His→Asn是最常见的一种，其自身就能赋予低水平抗性。对所有鉴定出的突变体均证明了对利福平、利福布汀和利福喷汀的交叉抗性。对利福霉素的抗性水平与突变位置和氨基酸取代类型均相关。
