Related Experiment Video

Updated: Aug 5, 2026

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays
12:25

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays

Published on: March 4, 2014

Isolation, characterization and biological activities of a toxin from Bacillus megaterium (B-23)

B Bhattacharyya, R P Purkayastha

    Indian Journal of Experimental Biology
    |December 1, 1989
    PubMed

    Insights

    Bacillus megaterium produces a potent fungitoxic substance that inhibits the growth of jute fungal pathogens. This natural toxin shows specific efficacy against various plant-pathogenic fungi.

    Area of Science:

    • Microbiology
    • Plant Pathology
    • Biochemistry

    Background:

    • Fungal diseases pose a significant threat to jute cultivation, impacting crop yield and quality.
    • The search for novel, eco-friendly fungicides is crucial for sustainable agriculture.
    • Bacillus megaterium is known to produce various bioactive compounds.

    Purpose of the Study:

    • To isolate and characterize a fungitoxic substance from Bacillus megaterium (B-23).
    • To evaluate the efficacy of this substance against key jute fungal pathogens.

    Main Methods:

    • Isolation of fungitoxic substance from the culture filtrate of B. megaterium.
    • Partial purification and characterization of the toxin, including its stability and solubility.
    • Testing the efficacy of the purified toxin against four jute fungal parasites: C. corchori, C. gloeosporioides, M. roridum, and A. citri.

    Main Results:

    • A fungitoxic substance was successfully isolated from B. megaterium culture filtrate.
    • The toxin is thermolabile, non-dialysable, ethyl acetate soluble, and effective between pH 5-9.
    • Maximum UV absorption was observed at 224 nm, with a melting point of 242°C.
    • The compound showed varying efficacy against jute pathogens, with M. roridum and C. corchori being the least and most sensitive, respectively.

    Conclusions:

    • Bacillus megaterium produces a potent, partially characterized fungitoxic compound with potential agricultural applications.
    • The isolated substance demonstrates selective toxicity against specific jute fungal pathogens, warranting further investigation for fungicide development.

    More Related Videos

    Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG12:23

    Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG

    Published on: May 16, 2017

    Bioprospecting of Extremophilic Microorganisms to Address Environmental Pollution07:20

    Bioprospecting of Extremophilic Microorganisms to Address Environmental Pollution

    Published on: December 31, 2021

    Related Concept Videos

    Techniques for Isolation of Pure Cultures01:24

    Techniques for Isolation of Pure Cultures

    Microorganisms are routinely cultured in the laboratory using various techniques to isolate, grow, and quantify them for further study. These methods rely on inoculating microorganisms into a suitable growth medium under aseptic conditions to prevent contamination. Depending on the objective, inoculation can involve direct transfer or the use of diluted bacterial suspensions as the inoculum.Streak-Plate Method for IsolationThe streak-plate method is a common technique for obtaining pure...
    Applications of Molecular Taxonomy01:20

    Applications of Molecular Taxonomy

    Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
    Production of Biopesticides01:18

    Production of Biopesticides

    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...
    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...