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Analysis and Specification of Starch Granule Size Distributions
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The Starch Utilization System Assembles around Stationary Starch-Binding Proteins.

Hannah H Tuson1, Matthew H Foley2, Nicole M Koropatkin2

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan.

Biophysical Journal
|January 18, 2018
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Summary
This summary is machine-generated.

Bacteroides thetaiotaomicron utilizes starch via the Sus complex. Starch-binding proteins SusE and SusF are immobile, forming a stable anchor for mobile enzyme partners like SusG.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacteroides thetaiotaomicron (Bt) is a key human gut microbe with significant glycan degradation capabilities.
  • The starch utilization system (Sus) in Bt's outer membrane is a model for polysaccharide utilization loci.
  • Previous studies showed SusG, a starch-degrading enzyme, moves on the cell surface.

Purpose of the Study:

  • To investigate the mobility and interaction of starch-binding proteins SusE and SusF within the Sus complex.
  • To elucidate the structural dynamics of the Sus system during starch utilization.
  • To propose a new model for protein complex formation in bacterial outer membranes.

Main Methods:

  • Single-molecule tracking to observe protein movement.
  • Super-resolution imaging for detailed visualization of the Sus complex.
  • Reverse genetics to assess the function of specific proteins.
  • Proteomics to identify protein interactions and abundance.

Main Results:

  • SusE and SusF were found to be immobile on the bacterial cell surface.
  • Immobility of SusE and SusF was consistent across different growth conditions and genetic knockouts.
  • This immobility was observed even when other Sus components were absent.

Conclusions:

  • Starch-binding proteins (SusE, SusF) form immobile anchors within the Sus complex.
  • Mobile enzymes (like SusG) transiently associate with these immobile binding proteins.
  • This suggests a novel mechanism for bacterial outer membrane protein complex organization and function.