Breaking Staphylococcus aureus biofilms with the antimicrobial lipopeptide humimycin and its synthetic analogs
Bibliographic record
Abstract
The growing burden of biofilm-associated infections and antibiotic resistance driven by Staphylococcus aureus underscores the urgent need for new antimicrobial agents and new strategies. To address this challenge, antimicrobial lipopeptides like humimycins have emerged as promising candidates for combating Staphylococcus aureus biofilms. In this study, humimycin A 1 and five structural analogs ( 2 - 6 ) were synthesized via solid-phase peptide synthesis and evaluated for antimicrobial and antibiofilm activity against S. aureus ATCC 29213. Minimum inhibitory concentrations (MIC) and minimum biofilm inhibitory concentrations (MBIC) values were determined using broth microdilution and crystal violet staining assays, respectively. Scanning electron microscopy (SEM) was used to visualize changes in biofilm morphology, while sliding motility assays assessed the impact on virulence-associated bacterial movement. The newly introduced analogs displayed MIC values ranging from 2 to 16 µg/mL, with analog 6 showing the strongest activity. In biofilm inhibition assays, analogs 5 and 6 exhibited MBIC of 4 µg/mL and 2 µg/mL, respectively, up to 16-fold lower than the parental compound. Treatment of mature biofilms with analogs 3–6 at four times the MIC led to biomass reductions ranging from 74.8 % to 89.8 %. Scanning electron microscopy confirmed disrupted biofilm architecture following treatment. Furthermore, analogs 4 and 6 significantly inhibited sliding motility, a virulence factor linked to colonization. Resistance development was not observed after 10 serial passages under sub-MIC treatments. These findings highlight the therapeutic potential of synthetic humimycin analogs as precision antibiofilm agents against S. aureus infections. • Synthetic humimycin analogs showed good antimicrobial activity against S. aureus . • The analogs are able to inhibit biofilm formation and disrupt mature biofilm. • The sliding motility of S. aureus was also inhibited by the synthetic lipopeptides. • Low emergence of resistance was observed after several expositions to the analogs.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".