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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...
Production of Biopesticides01:18

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Biopesticides offer a sustainable alternative to chemical pesticides, utilizing microbial agents to control agricultural pests. Bacillus thuringiensis (Bt) is a widely employed bacterium known for its potent insecticidal activity. Bt biopesticides are favored for their specificity to insect pests, minimal environmental impact, and natural degradability.Mechanism of Bt Toxin Action Bt produces insecticidal crystal (Cry) proteins during its sporulation phase. These proteins form parasporal...
Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...

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Related Experiment Video

Updated: May 8, 2026

Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy
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Interaction between mosquito-larvicidal Lysinibacillus sphaericus binary toxin components: analysis of complex

Avinash Kale1, Ramesh S Hire, Ashok B Hadapad

  • 1High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

Insect Biochemistry and Molecular Biology
|August 27, 2013
PubMed
Summary

Lysinibacillus sphaericus binary toxin components BinA and BinB weakly interact in solution. Crosslinking these proteins enhances their larvicidal activity, offering a promising strategy for mosquito-borne disease control.

Keywords:
BinA/BinB interactionsCovalent complexLarvicidal activityLysinibacillus sphaericus binary toxinMosquito control

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Published on: October 1, 2012

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Entomology

Background:

  • Lysinibacillus sphaericus binary toxin (BinA and BinB) is crucial for controlling mosquito-borne diseases.
  • The oligomeric form (BinA2.BinB2) is implicated in pore formation upon receptor binding.
  • The interaction between BinA and BinB in solution, without a receptor, remains unclear.

Purpose of the Study:

  • To investigate the interaction between the active BinA and BinB polypeptides in solution.
  • To understand how this interaction influences the toxin's activity.
  • To explore the potential of cross-linked BinA/BinB complexes as bio-pesticides.

Main Methods:

  • Size-exclusion chromatography
  • Pull-down assay
  • Surface plasmon resonance
  • Circular dichroism
  • Chemical crosslinking with glutaraldehyde

Main Results:

  • BinA and BinB exhibit weak interactions in solution with specific association and dissociation rate constants.
  • This interaction induces a conformational change, likely in BinA, potentially aiding membrane translocation.
  • Glutaraldehyde crosslinking stabilizes the BinA-BinB complex.
  • The cross-linked complex demonstrated maximal Culex larvicidal activity (LC50 = 1.59 ng mL(-1)).

Conclusions:

  • BinA and BinB interact weakly in solution, influencing toxin efficacy.
  • Stabilizing this interaction via crosslinking significantly enhances larvicidal potency.
  • The cross-linked BinA/BinB complex presents a promising avenue for developing novel bio-pesticides against mosquito vectors.