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Thermobifida fusca Cel6B moves bidirectionally while processively degrading cellulose.

Madeline M Johnson1, Antonio DeChellis2, Bhargava Nemmaru2

  • 1Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN, 37235, USA.

Biotechnology for Biofuels and Bioproducts
|December 5, 2024
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Summary
This summary is machine-generated.

Single-molecule optical tweezers revealed that Thermobifida fusca Cel6B (TfCel6B) exhibits unique motility patterns on cellulose. Enzyme velocity is primarily influenced by temperature and its carbohydrate-binding module, not substrate structure or applied force.

Keywords:
Thermobifida fuscaBiofuelBiofuelsCarbohydrate-binding moduleCel6BCellobiohydrolaseCellulaseCelluloseOptical tweezers

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Area of Science:

  • Biochemistry
  • Enzymology
  • Biotechnology

Background:

  • Cellulose is a promising renewable fuel feedstock, but its crystalline structure hinders enzymatic hydrolysis for biofuel production.
  • Understanding cellulase mechanisms is crucial for improving biofuel production efficiency.
  • Thermobifida fusca Cel6B (TfCel6B) is a thermostable, pH-insensitive cellulase with potential for industrial applications, but its hydrolysis mechanisms are not fully understood at the single-molecule level.

Purpose of the Study:

  • To investigate the single-molecule enzymatic activity and motility of Thermobifida fusca Cel6B (TfCel6B) on crystalline cellulose.
  • To elucidate the factors influencing TfCel6B's hydrolytic efficiency and processivity.
  • To compare single-molecule behavior with bulk enzymatic activity.

Main Methods:

  • Utilized optical tweezers to perform real-time, nanometer-scale measurements of single enzyme displacement during cellulose hydrolysis.
  • Assayed single-enzyme velocity and bulk ensemble activity on various crystalline cellulose allomorphs.
  • Monitored the catalytic domain of TfCel6B separately from the full-length enzyme.

Main Results:

  • TfCel6B exhibits processive motility with forward movement (0.17 nm/s), backward motions, and pauses, with run lengths around 5 nm.
  • Enzyme velocity is significantly affected by temperature and the presence of its carbohydrate-binding module, but minimally by substrate crystallinity or applied force.
  • The catalytic domain alone showed reduced velocity compared to the full-length enzyme.

Conclusions:

  • Unexpected motility patterns suggest novel mechanisms of processive cellulase action, potentially related to cellulose ultrastructure.
  • TfCel6B demonstrates low motility at room temperature, but velocity increases with temperature.
  • Engineering TfCel6B, focusing on its carbohydrate-binding module and linker, is a promising avenue for enhancing its industrial application in biofuel production.