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Streptomycin potency is dependent on MscL channel expression.

Irene Iscla1, Robin Wray1, Shuguang Wei2

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Dihydrostreptomycin enters bacterial cells by gating the mechanosensitive channel of large conductance (MscL). This novel mechanism explains streptomycin-induced potassium efflux and potential cell entry for treating microbial infections.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biophysics

Background:

  • Streptomycin is a crucial antibiotic for microbial infections, primarily inhibiting bacterial translation.
  • The precise mechanism of streptomycin entry into bacterial cells remains largely unknown.
  • Previous observations noted streptomycin-induced potassium efflux, suggesting a role for ion channels in its action.

Purpose of the Study:

  • To identify compounds targeting the mechanosensitive channel of large conductance (MscL).
  • To elucidate the role of MscL in streptomycin's mechanism of action and cell entry.

Main Methods:

  • High-throughput screening to identify MscL-targeting compounds.
  • Electrophysiological studies to assess MscL channel activity.
  • Investigating the necessity of MscL for streptomycin-induced potassium efflux.

Main Results:

  • Dihydrostreptomycin was identified as a hit in a screen for MscL-targeting compounds.
  • MscL is essential for the streptomycin-induced potassium efflux.
  • Dihydrostreptomycin directly modulates MscL channel activity.

Conclusions:

  • Gating of MscL represents a novel mode of action for dihydrostreptomycin.
  • The large pore of MscL may facilitate dihydrostreptomycin entry into bacterial cells.
  • Understanding this mechanism could lead to improved antibiotic strategies.