Related Experiment Video
Updated: Jul 16, 2026
09:54
Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
Published on: August 20, 2018
Enhancing the Antimicrobial Potency of Self-Assembling Antibiotics by Co-Assembly-Based Aggregation Modulation.
Bodhisattwa Das Gupta1, Rahul Kuiri1, Thangavel Vijayakanth2,3
1Department of Biotechnology, National Institute of Technology Durgapur, A-Zone, Mahatma Gandhi Road, Durgapur, West Bengal, India.
Macromolecular Bioscience
|July 15, 2026
Summary
Modulating antimicrobial peptide (AMP) interactions enhances their potency. Co-assembling Fmoc-phenylalanine with Fmoc-glutamic acid broadens its antibacterial spectrum by disrupting bacterial membranes.
Area of Science:
- Biochemistry
- Materials Science
- Microbiology
Background:
- Antimicrobial peptides (AMPs) show promise as alternatives to conventional antibiotics.
- AMP activity is influenced by aggregation; weaker associations enhance function, while stable assemblies decrease it.
- Modulating intermolecular interactions is a potential strategy to boost AMP efficacy.
Purpose of the Study:
- To develop a general strategy for enhancing AMP potency.
- To broaden the activity spectrum of a Gram-positive-specific AMP, Fmoc-phenylalanine.
- To investigate the role of co-assembly with non-antibiotic peptides in modulating AMP function.
Main Methods:
- Co-assembly of Fmoc-phenylalanine with Fmoc-glutamic acid.
- Biophysical assays to assess membrane disruption and cell death.
- Rheological measurements to evaluate hydrogel mechanical rigidity.
- Molecular dynamics simulations to analyze fibril stability and interactions.
Main Results:
- Co-assembly broadened the activity spectrum of Fmoc-phenylalanine against Gram-positive bacteria.
- The co-assembled system effectively disrupted bacterial membrane integrity, causing cell death.
- Enhanced potency correlated with reduced hydrogel mechanical rigidity.
- Molecular dynamics simulations indicated that heterogeneous non-covalent interactions destabilized peptide fibrils.
Conclusions:
- Rationally designed co-assembling partners can weaken stabilizing non-covalent interactions.
- This weakening effect enhances the antibacterial efficacy of existing AMPs.
- Co-assembly presents a common strategy to improve AMP potency and broaden their spectrum of activity.
Related Concept Videos
02:41Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
01:27Combined Effects of Drugs: Synergism
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
00:57Antibiotic Selection
Overview
01:27Production of Antibiotics
Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
01:30Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...