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Interaction between poly[(R)-3-hydroxybutyrate] depolymerase and biodegradable polyesters evaluated by atomic force

Masahiro Fujita1, Yuka Kobori, Yoko Aoki

  • 1Polymer Chemistry Laboratory, RIKEN Institute, Wako-shi, Saitama, Japan. mfujita@riken.jp

Langmuir : the ACS Journal of Surfaces and Colloids
|December 1, 2005
PubMed
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PHB depolymerase specifically binds to biodegradable polyesters like PHB and PLLA. Atomic force microscopy revealed single molecule interactions with a rupture force of approximately 100 pN.

Area of Science:

  • Biochemistry
  • Materials Science
  • Microbiology

Background:

  • Biodegradable polyesters such as polyhydroxybutyrate (PHB) and polylactic acid (PLLA) are environmentally significant materials.
  • Understanding the enzymatic degradation of these polymers is crucial for developing effective recycling and disposal methods.
  • Ralstonia pickettii T1 produces PHB depolymerase, an enzyme capable of breaking down PHB.

Purpose of the Study:

  • To investigate the specific adsorption of PHB depolymerase from Ralstonia pickettii T1 onto biodegradable polyesters.
  • To quantify the binding forces between the enzyme's substrate-binding domain (SBD) and polyester surfaces.
  • To elucidate the molecular interactions governing enzyme-polyester adhesion.

Main Methods:

  • Utilized atomic force microscopy (AFM) with functionalized tips.

Related Experiment Videos

  • Immobilized the substrate-binding domain (SBD) of PHB depolymerase onto AFM tips via a self-assembled monolayer.
  • Performed force-distance measurements to analyze the interaction between SBD-functionalized tips and PHB/PLLA surfaces.

    • Main Results:

    • Observed frequent multiple pull-off events during AFM tip retraction, indicating specific binding.
    • Estimated the single rupture force for SBD-polyester interactions to be approximately 100 pN for both PLLA and PHB.
    • Confirmed specific adsorption by observing reduced interactions with polyethylene and the persistence of binding even with surfactants present.

    Conclusions:

    • PHB depolymerase exhibits specific adsorption to the surfaces of biodegradable polyesters (PHB and PLLA).
    • The measured unbinding force is primarily attributed to the interaction between a single SBD molecule and the polymer surface.
    • These findings provide insights into the molecular mechanisms of enzymatic degradation of polyesters.