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Biomimetic Materials to Characterize Bacteria-host Interactions
12:22

Biomimetic Materials to Characterize Bacteria-host Interactions

Published on: November 16, 2015

Proteolytic activation of Vibrio mimicus (Vm) major outer membrane protein haemagglutinin (HA) with Vm-HA/protease:

Munirul Alam1, Shin-ichi Miyoshi, Kabir Uddin Ahmed

  • 1Laboratory of Enteric Microbiology, International Center for Diarrhoeal Disease Research, Dhaka, Bangladesh. munirul@icddrb.org

Microbiology and Immunology
|November 23, 2006
PubMed

Insights

Vibrio mimicus haemagglutinins interact, enhancing bacterial adherence. This study reveals a novel mechanism involving outer membrane protein activation, crucial for Vibrio mimicus adhesion.

Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Vibrio mimicus haemagglutinins (HAs), including extracellular HA/protease and outer membrane protein-HA (OMPHA), are known adherence factors.
  • The precise mechanism coordinating these HAs for bacterial adherence is not fully understood.

Purpose of the Study:

  • To investigate the interaction between Vibrio mimicus HA/protease and OMPHA.
  • To elucidate the mechanism by which these haemagglutinins contribute to bacterial adherence.

Main Methods:

  • Investigated the interaction between Vm-HA/protease and Vm-OMPHA.
  • Utilized SDS-PAGE to confirm limited proteolysis of Vm-OMPHA.
  • Demonstrated proteolytic activation of cell-associated Vm-OMPHA in various V. mimicus strains.
  • Tested activation using proteases from bacterial and eukaryotic sources.

Main Results:

  • A positive interaction between Vm-HA/protease and Vm-OMPHA was identified, significantly enhancing haemagglutinating ability.
  • Limited proteolysis of Vm-OMPHA was observed, although no cleaved polypeptide was detected.
  • Proteolytic activation of native cell-associated Vm-OMPHA was confirmed across multiple V. mimicus strains.
  • External proteases also induced proteolytic activation of OMPHA.

Conclusions:

  • Findings suggest a novel coordination mechanism for Vibrio mimicus haemagglutinins in bacterial adherence.
  • The interaction and proteolytic activation of Vm-OMPHA represent a key aspect of V. mimicus adhesion.
  • This study provides new insights into the molecular basis of Vibrio mimicus pathogenesis.

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