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Inhibition of membrane potential-dependent amino acid transport by daptomycin

N E Allen1, W E Alborn, J N Hobbs

  • 1Infectious Disease Research, Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana 46285-0428.

Antimicrobial Agents and Chemotherapy
|December 11, 1991
PubMed

Insights

Daptomycin disrupts amino acid transport, inhibiting bacterial cell wall formation in Bacillus megaterium. This action may stem from its disruption of the transmembrane electrochemical gradient.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Peptidoglycan is essential for bacterial cell wall integrity.
  • Daptomycin is a lipopeptide antibiotic with a unique mechanism of action.
  • Understanding daptomycin's precise inhibitory targets is crucial for antibiotic development.

Purpose of the Study:

  • To elucidate the specific mechanism by which daptomycin inhibits peptidoglycan formation in Bacillus megaterium.
  • To investigate the role of amino acid transport in daptomycin's inhibitory effects.
  • To explore the potential involvement of the transmembrane electrochemical gradient.

Main Methods:

  • Investigated the effect of daptomycin on UDP-N-acetylmuramyl-pentapeptide formation.
  • Assessed daptomycin's impact on the active transport of amino acids.
  • Examined the correlation between daptomycin's action and the transmembrane electrochemical gradient.

Main Results:

  • Daptomycin was found to inhibit UDP-N-acetylmuramyl-pentapeptide formation.
  • The antibiotic's action was linked to the inhibition of active amino acid transport.
  • Evidence suggests daptomycin disrupts the transmembrane electrochemical gradient.

Conclusions:

  • Daptomycin inhibits Bacillus megaterium peptidoglycan synthesis by targeting active amino acid transport.
  • Disruption of the transmembrane electrochemical gradient is a likely mechanism for daptomycin's antibacterial activity.
  • These findings provide insights into daptomycin's molecular targets and potential for novel antibiotic strategies.

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