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Related Concept Videos

Bacterial Toxins01:12

Bacterial Toxins

Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
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Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.
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Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
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Bacterial Gastroenteritis

Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
Receptor-mediated Endocytosis01:20

Receptor-mediated Endocytosis

Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
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Updated: May 26, 2026

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
07:11

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

Published on: September 28, 2022

Engineering cyclic peptide toxins.

Richard J Clark1, David J Craik

  • 1School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia.

Methods in Enzymology
|January 11, 2012
PubMed
Summary
This summary is machine-generated.

Re-engineering toxic peptides using solid-phase synthesis enhances their stability and bioavailability. This approach improves their potential as therapeutic and diagnostic agents, overcoming natural peptide limitations.

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Last Updated: May 26, 2026

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10:12

Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers

Published on: September 19, 2022

Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Pharmacology

Background:

  • Peptide toxins show promise for drug development due to high potency and receptor selectivity.
  • Natural peptides often exhibit poor in vivo stability and bioavailability, limiting therapeutic applications.
  • Naturally occurring cyclic peptides possess enhanced stability, offering a model for improvement.

Purpose of the Study:

  • To describe solid-phase chemical synthetic methods for reengineering peptide toxins.
  • To enhance the suitability of peptide toxins as therapeutic, diagnostic, or imaging agents.
  • To apply lessons from cyclic peptides to improve non-cyclic toxin suitability.

Main Methods:

  • Solid-phase chemical synthesis.
  • Reengineering of disulfide-rich peptides from cone snails and scorpions.
  • Focus on structural and stability studies.

Main Results:

  • Demonstration of solid-phase synthetic methods for peptide toxin reengineering.
  • Potential to improve in vivo stability and bioavailability of peptide toxins.
  • Broad applicability to various peptide-based toxins.

Conclusions:

  • Solid-phase synthesis is a viable method for reengineering peptide toxins.
  • Reengineered toxins can overcome limitations of natural peptides for therapeutic use.
  • This technology holds promise for developing novel diagnostic and imaging agents.