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Related Experiment Videos

Bactericidal Permeability-Increasing Proteins Shape Host-Microbe Interactions.

Fangmin Chen1,2,3, Benjamin C Krasity3, Suzanne M Peyer3

  • 1Department of Microbiology, College of Resources, Sichuan Agricultural University, Chengdu, Sichuan, People's Republic of China.

Mbio
|April 6, 2017
PubMed
Summary

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Bactericidal permeability-increasing proteins (BPIs) in squid modulate symbiotic bacteria, controlling populations in light organs and preventing colonization elsewhere. These proteins play dual defensive roles in early life stages.

Area of Science:

  • Marine Biology
  • Immunology
  • Microbiology

Background:

  • Bactericidal permeability-increasing proteins (BPIs) are crucial immune molecules in animals.
  • The squid-vibrio symbiosis involves complex host-microbe interactions requiring immune modulation.
  • Previous research has not fully elucidated the roles of BPIs in invertebrate symbiosis.

Purpose of the Study:

  • To characterize the BPIs of the squid *Euprymna scolopes* (EsBPI2 and EsBPI4).
  • To investigate the antimicrobial activity of EsBPIs against the symbiotic bacterium *Vibrio fischeri*.
  • To determine the localization and differential roles of EsBPIs in host defense and symbiont modulation.

Main Methods:

  • Molecular characterization and phylogenetic analysis of EsBPI2 and EsBPI4.
Keywords:
Vibrio fischeriantimicrobial peptidesbioinformaticsconfocal microscopysymbiosis

Related Experiment Videos

  • Purification of EsBPIs and assessment of antimicrobial activity in vitro.
  • Heat inactivation, antibody neutralization, and acid pretreatment assays to study protein function.
  • Immunocytochemistry to localize EsBPIs within squid tissues.

    • Main Results:

    • EsBPI2 and EsBPI4 share molecular characteristics with other animal BPIs and are phylogenetically related to invertebrate BPIs.
    • Purified EsBPIs exhibit antimicrobial activity against *Vibrio fischeri*, which is heat-labile and antibody-sensitive.
    • *V. fischeri* exhibits increased resistance to EsBPIs after acid pretreatment, mimicking symbiosis initiation conditions.
    • EsBPIs are localized to the light organ and other epithelial surfaces; EsBPI2 has a broader distribution including blood and a juvenile organ.

    Conclusions:

    • EsBPI2 and EsBPI4 are key components of the innate immune system in *E. scolopes*.
    • These BPIs play distinct roles in modulating the squid's symbiont, *V. fischeri*.
    • The proteins contribute to controlling symbiont density in the light organ and preventing its colonization of other host tissues.