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Related Experiment Videos

Sequential assembly of collagen revealed by atomic force microscopy

M Gale1, M S Pollanen, P Markiewicz

  • 1Department of Chemistry, University of Toronto, Ontario, Canada.

Biophysical Journal
|May 1, 1995
PubMed
Summary

Atomic force microscopy revealed collagen assembly intermediates. Collagen monomers form oligomers via end-to-end association, followed by lateral association into higher-order filaments.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Materials Science

Background:

  • Biological filament assembly typically follows nucleation-elongation or stepwise mechanisms.
  • Understanding intermediate species is crucial for elucidating complex assembly processes.

Purpose of the Study:

  • To investigate the early events in the sequential assembly of collagen filaments using atomic force microscopy (AFM).
  • To correlate structural intermediates observed by AFM with turbidimetric changes during collagen assembly.

Main Methods:

  • In vitro assembly of collagen monomers.
  • Examination of early structural intermediates using Atomic Force Microscopy (AFM).
  • Correlation of AFM observations with turbidimetric measurements.

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Main Results:

  • Observed sequential formation of collagenous filamentous species with increasing diameter and length.
  • Identified initial collagen oligomers (1-2 nm diameter, 300-500 nm length).
  • Detected larger filaments (2-6 nm diameter, >10 microns length) with a ~67 nm axial period, and mature fibrils later in assembly.

Conclusions:

  • Collagen assembly involves initial end-to-end monomer association to form oligomers.
  • Subsequent lateral association of oligomers leads to higher-order filaments.
  • Distinct axial and lateral interactions govern different levels of the collagen assembly hierarchy.