Predictive compound accumulation rules yield a broad-spectrum antibiotic.

Area of Science:

• Microbiology
• Medicinal Chemistry
• Drug Discovery

Background:

• Gram-negative bacteria possess an outer membrane that restricts small molecule entry, complicating the development of new antibiotics.
• Existing knowledge on molecule accumulation is based on retrospective studies, identifying polarity and molecular weight as primary factors.

Purpose of the Study:

• To identify the physicochemical properties that enable small molecules to accumulate within Gram-negative bacteria.
• To guide the rational design of novel antibiotics targeting these challenging pathogens.

Main Methods:

• Assessed the accumulation of over 180 diverse compounds in Escherichia coli.
• Utilized computational analysis to identify key physicochemical properties correlated with accumulation.

Main Results:

• Contrary to previous findings, optimal accumulation was associated with molecules containing an amine group, amphiphilicity, rigidity, and low globularity.
• These identified properties were successfully applied to modify deoxynybomycin, creating an antibiotic effective against Gram-negative bacteria.

Conclusions:

• The study redefines the physicochemical guidelines for small molecule accumulation in Gram-negative bacteria.
• These findings provide a foundation for developing novel antibiotics against multi-drug-resistant Gram-negative pathogens.