Related Experiment Video

Updated: Nov 10, 2025

Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG
12:23

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

Published on: May 16, 2017

7.8K

The Crystal Structure of Bacillus cereus HblL1

Harley L Worthy1,2, Lainey J Williamson1, Husam Sabah Auhim1,3

  • 1School of Biosciences, Cardiff University, Park Place, Cardiff CF10 3AX, UK.

Toxins
|April 3, 2021
PubMed

Insights

The Hbl toxin

Area of Science:

  • Microbiology and Toxinology
  • Structural Biology

Background:

  • The Hbl toxin complex from Bacillus cereus sensu lato causes food poisoning-associated diarrhea.
  • The structure of HblB is known, but HblL1 and HblA structures remain elusive.

Purpose of the Study:

  • To determine the structure of the HblL1 component of the Hbl toxin.
  • To investigate potential interactions between HblL1 and HblB.

Main Methods:

  • Recombinant expression of the HblL1 component.
  • X-ray crystallography to elucidate HblL1 structure to 1.36 Å resolution.
  • Molecular docking simulations to predict HblL1-HblB interactions.

Main Results:

  • The crystal structure of HblL1 was determined, revealing it as an alpha-helical pore-forming toxin.
  • HblL1 possesses an extended hydrophobic beta tongue region, potentially crucial for pore formation.
  • Molecular docking suggests a head-to-tail dimer formation between HblL1 and HblB, potentially burying the HblL1 beta tongue.

Conclusions:

  • The determined structure of HblL1 provides insights into the Hbl toxin complex's mechanism.
  • The extended beta tongue and predicted dimer formation offer a structural basis for Hbl toxin's function in pore formation and cytotoxicity.
  • Further studies can explore the functional implications of the HblL1-HblB interaction in Bacillus cereus pathogenesis.

Keywords:
Bacillus cereushaemolytic toxinhemolytic toxintripartite toxin

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