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Minocycline resistance in an oral Streptococcus infantis isolate is encoded by tet(S) on a novel small low copy number plasmid

机译:口服链球菌婴儿分离物中的米诺环素抗性由tet(S)编码在新颖的小拷贝数质粒上

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摘要

We have determined the genetic basis of minocycline resistance in a strain of Streptococcus infantis isolated from a healthy human oral cavity. We demonstrate that tet(S), identical to tet(S) found on the enterococcal conjugative transposon Tn6000, is responsible for the observed resistance. The gene is located on a small, low copy number plasmid and is flanked by IS1216 elements. The tet(S) gene is capable of excising from the plasmid together with one of the IS1216 elements. The plasmid contains a putative toxin/antitoxin system related to relBE. Deletion of the toxin, relE, did not result in plasmid instability but did increase the fitness of the mutant compared to the wild-type strain.
机译:我们已经确定了从健康人类口腔中分离出的婴儿链球菌菌株中米诺环素抗性的遗传基础。我们证明tet(S),与在肠球菌结合转座子Tn6000上发现的tet(S)相同,是观察到的耐药性的原因。该基因位于一个低拷贝数的小质粒上,侧翼为IS1216元件。 tet(S)基因能够与IS1216元件之一一起从质粒中切除。质粒包含与relBE相关的推定毒素/抗毒素系统。与野生型菌株相比,毒素relE的删除没有导致质粒不稳定,但是确实增加了突变体的适应性。

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