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Lethal factor active-site mutations affect catalytic activity in vitro

S E Hammond1, P C Hanna

  • 1Department of Microbiology, Duke University Medical Center, Durham, North Carolina 27710, USA.

Infection and Immunity
|May 9, 1998
PubMed
Summary
This summary is machine-generated.

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Bacillus anthracis lethal factor (LF) acts as a zinc metalloprotease, hydrolyzing proline-containing peptides in vitro. This study provides the first direct evidence of LF

Area of Science:

  • Biochemistry
  • Microbiology
  • Proteomics

Background:

  • Bacillus anthracis lethal toxin's lethal factor (LF) possesses a zinc-binding motif (HEXXH) and is hypothesized to be a Zn2+ metalloprotease.
  • Previous research suggested LF's function in macrophages, but direct proteolytic activity on substrates remained unproven.

Purpose of the Study:

  • To investigate the in vitro proteolytic activity of Bacillus anthracis lethal factor (LF).
  • To identify potential substrates and characterize the catalytic mechanism of LF.

Main Methods:

  • In vitro hydrolysis of synthetic peptides by purified LF.
  • Analysis of cleavage products using mass spectrometry and high-pressure liquid chromatography (HPLC).
  • Site-directed mutagenesis of active-site residues and inhibition assays with various chelators and protease inhibitors.

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Main Results:

  • LF demonstrated proteolytic activity, hydrolyzing synthetic peptides, with a preference for proline-containing substrates.
  • Mutations in active-site residues and the addition of zinc chelators (1,10-phenanthroline, EDTA) abolished LF activity.
  • Specific inhibitors like ZINCOV blocked LF activity, while others (bestatin, lysine CMK) did not affect in vitro function.

Conclusions:

  • These findings provide the first direct evidence that Bacillus anthracis LF functions as an endopeptidase.
  • LF's catalytic activity is dependent on Zn2+ and its active-site residues.
  • The substrate preference for proline-containing peptides offers insights into LF's mechanism of action.