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Immunology and Microbiology · Research topic

Open research questions in Antimicrobial Peptides and Activities

27 unresolved questions extracted from the limitations and future-work sections of 181 Antimicrobial Peptides and Activities papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • AimsAntimicrobial peptide (AMP) combinations have been proposed to delay resistance evolution, but it remains unclear what properties of a peptide pair determine whether a combination reduces resistance evolution relative to its component AMPs used alone.

    Cross-Resistance Limits the Ability of Antimicrobial Peptide Combinations to Delay Resistance Evolution · 2026 · DOI

  • 9 (F3), derived from Australian tree frogs, have demonstrated broad antimicrobial activity, but their combined antibacterial and immunomodulatory mechanisms remain incompletely understood.

    Caerin 1.1/1.9 peptides control Acinetobacter baumannii infection through combined antibacterial and host-directed immunomodulatory mechanisms · 2026 · DOI

  • The bovine cathelicidin BMAP-28 is a cationic α-helical AMP with broad-spectrum activity, but its effects on enterococci and determinants of susceptibility remain unclear.

    Species-dependent susceptibility of enterococci to bovine cathelicidin BMAP-28 and its relationship to membrane fatty acid composition · 2026 · DOI

  • The paper analyzes membrane integrity data only within the 30–60 minute window post-peptide treatment; the fate of bacterial cells and extent of lipid remodeling at longer timepoints (beyond 2 hours) or after complete membrane disruption is not characterized, particularly whether surviving cells with altered lipid composition exhibit stress-induced tolerance mechanisms.

    Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack · 2026 · DOI

  • The outer membrane permeability assay uses NPN fluorescence exclusively in E. coli; no investigation is presented on whether this NPN-based approach is applicable to Gram-positive bacteria or other Gram-negative species, limiting generalizability of the lipid remodeling and antimicrobial peptide interaction findings beyond the single model organism tested.

    Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack · 2026 · DOI

  • While the paper uses multiple viability assays (intracellular esterase activity via Calcein AM and ATP-based metabolic activity via BacTiter-Glo), it does not address potential discrepancies between these two markers during antimicrobial peptide attack, particularly whether cells with compromised membranes retain esterase activity while ATP is depleted, or vice versa.

    Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack · 2026 · DOI

  • The antimicrobial activity assessment defines IC100% (growth inhibition) and LC99.9 (lethal concentration) but does not specify whether these metrics were directly compared between the two peptides (melittin and LL-37) tested, nor does it establish whether lipid remodeling under stress conditions alters the IC100% or LC99.9 values in a strain-dependent manner.

    Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack · 2026 · DOI

  • The zeta potential measurements were performed only at a single 5-minute timepoint at room temperature with n=2 replicates; the paper lacks investigation of how zeta potential changes dynamically over the 2-hour experimental window used in other membrane integrity assays, and whether peptide-induced lipid remodeling produces measurable surface charge alterations at multiple time intervals.

    Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack · 2026 · DOI

  • The membrane depolarization assay using DiSC3(5) dye was noted as more sensitive to subtle membrane integrity changes than the PI assay, but the paper does not systematically characterize the temporal resolution or threshold sensitivity differences between these three bacterial membrane integrity assessment methods (NPN outer membrane permeability, PI inner membrane permeability, and DiSC3(5) depolarization) across varying antimicrobial peptide concentrations.

    Bacterial cell fate under stress: lipid remodeling and antimicrobial peptide attack · 2026 · DOI

  • Our findings describe a family of anuran skin-secreted AMP genes that has grown and diversified in a manner similar to other AMP families, but many of the factors shaping the evolution and expression of these AMP genes remain unclear. While this is compelling, the underlying exon shuffling process has yet to be demonstrated in anuran AMP genes, and it remains unclear why the signal peptide sequence is so constrained.

    The Rana sylvatica skin-secreted antimicrobial peptide (AMP) gene repertoire highlights broader patterns in anuran AMP evolution · 2026 · DOI

  • Secondary structure predictions of mature AMPs were performed using PEP-FOLD4, but no experimental validation (such as circular dichroism or NMR spectroscopy) is mentioned to confirm predicted structures.

    The Rana sylvatica skin-secreted antimicrobial peptide (AMP) gene repertoire highlights broader patterns in anuran AMP evolution · 2026 · DOI

  • The paper analyzes AMP gene transcript abundance in response to Batrachochytrium dendrobatidis exposure, but does not discuss functional validation of whether these transcript changes translate to altered antimicrobial peptide production or enhanced pathogen resistance.

    The Rana sylvatica skin-secreted antimicrobial peptide (AMP) gene repertoire highlights broader patterns in anuran AMP evolution · 2026 · DOI

  • Future research should explore the conservation of this mechanism across diverse citrus species and evaluate its field efficacy, further validating its potential for sustain- able citrus production. Furthermore, whether CsPep-medi- ated resistance involves stomatal immunity remains to be determined. It remains to be seen whether a similar stomatal defense mechanism is engaged in citrus in response to CsPep treatment, and whether this regulation involves homologous ion channels, which represent important areas for future investigation.

    Identification of plant elicitor peptides in citrus and the dual regulatory effects of CsPep on plant regeneration and canker resistance · 2026 · DOI

  • Although accumulating evidence highlights the capacity of microbial metabolites to modulate defensin expression, a comprehensive and integrated understanding of the cross-talk between these microbial metabolites and host defensins remains lacking.

    Mechanisms and Implications of Gut Microbiota-Derived Metabolites in the Regulation of Poultry Defensins · 2026 · DOI

  • Environmental microbiomes from understudied regions represent a valuable source of antimicrobial peptide (AMP) candidates.

    Integrated Genome Mining, Bacterial Co-Culture Activation, and Peptidomic Analyses Identify Antimicrobial Peptide Candidates from South American Bacteria · 2026 · DOI

  • Nevertheless, the present conclusions are limited by the reliance on in vitro models, which do not fully reflect the complexity of the tumor microenvironment or intertumoral heterogeneity.

    Synergistic anticancer activity of antimicrobial peptide nisin and doxorubicin against breast cancer cells via modulation of membrane permeability · 2026 · DOI

  • Furthermore, although biofilm targeting is a promising strategy against persistent infections, it remains underexplored, as most synergy stud- ies are limited to planktonic models, leaving peptide-medi- ated biofilm eradication poorly understood.

    Antimicrobial Peptides as Antibiotic Adjuvants: Overcoming Resistance through Multifaceted Mechanisms · 2026 · DOI

  • Use of training sequences is recommended in applications where there is limited knowledge of the peptide characteristics, and in such cases, a combination of positive and negative training sequences along with rationales should be incorporated.

    Design and classify innovative antimicrobial and dual- and multi-functional peptides using generative artificial intelligence · 2026 · DOI

  • Future research should explore the conservation of this mechanism across diverse citrus species and evaluate its field efficacy, further validating its potential for sustain- able citrus production.

    Identification of plant elicitor peptides in citrus and the dual regulatory effects of CsPep on plant regeneration and canker resistance · 2026 · DOI

  • While physicochemical properties (molecular mass, net charge, pI, hydrophobicity) are calculated in silico for mature AMPs, the relationship between these properties and actual antimicrobial efficacy is not explored.

    The Rana sylvatica skin-secreted antimicrobial peptide (AMP) gene repertoire highlights broader patterns in anuran AMP evolution · 2026 · DOI

  • There are still many aspects of the nature of pheromone plasmids that remain unclear and more detailed studies are needed to understand their uniqueness and complexity.

    Complex Nature of Enterococcal Pheromone-Responsive Plasmids · 2010 · DOI

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27 open questions have been extracted from the limitations and future-work passages of 181 Antimicrobial Peptides and Activities papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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