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A mechanism for temporary bioadhesion.

Julia Wunderer1,2, Birgit Lengerer1,2,3, Robert Pjeta1,2

  • 1Institute of Zoology, University of Innsbruck, 6020 Innsbruck, Austria.

Proceedings of the National Academy of Sciences of the United States of America
|February 21, 2019
PubMed
Summary
This summary is machine-generated.

The flatworm Macrostomum lignano uses two adhesive proteins for temporary attachment to surfaces. A novel model explains how these proteins mediate reversible adhesion, offering insights for biofouling control and synthetic adhesives.

Keywords:
Platyhelminthesbioadhesionbioadhesivedetachmentflatworms

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Area of Science:

  • Marine biology
  • Biochemistry
  • Materials science

Background:

  • The flatworm Macrostomum lignano possesses a unique duo-gland adhesive system for rapid substrate attachment and detachment in marine environments.
  • The molecular mechanisms underlying this temporary adhesion are not well understood.

Purpose of the Study:

  • To identify and characterize the key molecules involved in Macrostomum lignano temporary adhesion.
  • To elucidate the mechanism of reversible adhesion in M. lignano.
  • To explore potential applications in biofouling mitigation and synthetic adhesive development.

Main Methods:

  • Identification and localization of adhesive proteins (Mlig-ap1 and Mlig-ap2) in M. lignano gland cells.
  • RNA interference (RNAi) to assess the function of Mlig-ap1 and Mlig-ap2 in adhesion.
  • Inhibition assays using charged molecules and assessment of surface hydration effects on adhesion.

Main Results:

  • Two large adhesive proteins, Mlig-ap1 and Mlig-ap2, were identified and found to be essential for M. lignano adhesion.
  • Protein distribution within adhesive footprints was spatially restricted.
  • Adhesion was inhibited by negatively charged sugars and prevented by strongly hydrated surfaces, while detachment was hindered by positively charged molecules.
  • A model for reversible adhesion involving Mlig-ap2 (attachment), Mlig-ap1 (cohesion), and a secreted negatively charged molecule (detachment) was proposed.

Conclusions:

  • Mlig-ap1 and Mlig-ap2 are crucial for the temporary adhesion of Macrostomum lignano.
  • The proposed attachment-release model provides a framework for understanding reversible adhesion in this species.
  • Findings have implications for biofouling control and the design of novel reversible adhesive systems.