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In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen
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Collagen Alpha 1(XI) Amino-Terminal Domain Modulates Type I Collagen Fibril Assembly.

Abu Sayeed Chowdhury1, Julia Thom Oxford2

  • 1Biomolecular Sciences Graduate Program, Boise State University, 1910 University Drive, Boise, Idaho 83725, United States.

Biochemistry
|January 22, 2025
PubMed
Summary
This summary is machine-generated.

Collagen α1(XI) N-terminal domain isoforms specifically regulate collagen fibrillogenesis. These isoforms influence self-assembly kinetics, impacting fibril formation rates and final yield.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • The amino-terminal domain (NTD) of collagen α1(XI) is crucial for collagen fibrillogenesis.
  • The precise mechanisms by which different collagen α1(XI) isoforms control this process remain unclear.

Purpose of the Study:

  • To investigate the isoform-specific effects of collagen α1(XI) NTD on collagen type I self-assembly kinetics.
  • To elucidate the molecular mechanisms underlying isoform-specific regulation of fibrillogenesis.

Main Methods:

  • In vitro kinetic measurements of collagen type I self-assembly.
  • Molecular dynamics simulations and protein-protein docking.
  • Molecular mechanics Poisson-Boltzmann surface area (MM/PBSA) calculations.
  • Thermodynamic analyses.

Main Results:

  • Isoform-specific differences were observed in rate constants, activation energy, and binding free energy during self-assembly.
  • Isoform A, with an acidic variable region, increased activation energy and decreased the growth phase rate constant.
  • Isoform B exhibited less steric hindrance, while Isoform 0 showed the highest activation energy and lowest growth rate.
  • Despite reduced growth rates, isoforms increased final turbidity, suggesting enhanced fibril yield.

Conclusions:

  • Collagen α1(XI) NTD isoforms differentially modulate collagen fibrillogenesis kinetics.
  • Isoform-specific interactions and variable region chemistry dictate effects on fibril formation rate and yield.
  • These findings highlight the role of collagen α1(XI) isoforms in optimizing fibrillogenesis for increased final collagen yield.