Scholarlink

<p>The RsmG methyltransferase modifies G527 in bacterial 16S rRNA and its inactivation confers low level streptomycin resistance. In contrast, high level streptomycin resistance typically requires specific alterations in ribosomal protein uS12 or 16S rRNA. Here, we have asked if <i>rsmG</i> inactivation alters the phenotypes of any of a collection of randomly-generated <i>Escherichia coli</i> uS12 mutants. While several uS12 mutants show moderately increased resistance to streptomycin when <i>rsmG</i> is inactivated (MIC = 10–40 µg/ml), a uS12 R85H/<i>rsmG</i>-inactivated strain uniquely displays very high resistance (MIC &gt; 1,024 µg/ml). Additional genetic selections showed that <i>rsmG</i> null mutations combined with specific alterations in uS12 can generate streptomycin-dependence, or pseudo-dependence, in addition to resistance. Moreover, growth of several of these mutants on high concentrations of streptomycin is conditional on <i>rsmG</i> inactivation. Thus, loss of m<sup>7</sup>G527 methylation affects the streptomycin phenotypes of distinct uS12 mutants and identifies an additional route to high-level streptomycin resistance in bacteria.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

RsmG methylation of 16S rRNA affects the function of ribosomal protein uS12

  • 期刊论文

  • 发表日期：

    2025年5月16日

查看全文
  • Trevor W. Bell,
  • Rowan M. Turner,
  • Amanda M. Merryman,
  • Juliana J. Joseph,
  • Steven T. Gregory,
  • Michael O’Connor

摘要

The RsmG methyltransferase modifies G527 in bacterial 16S rRNA and its inactivation confers low level streptomycin resistance. In contrast, high level streptomycin resistance typically requires specific alterations in ribosomal protein uS12 or 16S rRNA. Here, we have asked if rsmG inactivation alters the phenotypes of any of a collection of randomly-generated Escherichia coli uS12 mutants. While several uS12 mutants show moderately increased resistance to streptomycin when rsmG is inactivated (MIC = 10–40 µg/ml), a uS12 R85H/rsmG-inactivated strain uniquely displays very high resistance (MIC > 1,024 µg/ml). Additional genetic selections showed that rsmG null mutations combined with specific alterations in uS12 can generate streptomycin-dependence, or pseudo-dependence, in addition to resistance. Moreover, growth of several of these mutants on high concentrations of streptomycin is conditional on rsmG inactivation. Thus, loss of m7G527 methylation affects the streptomycin phenotypes of distinct uS12 mutants and identifies an additional route to high-level streptomycin resistance in bacteria.