Related Experiment Video
Updated: Jun 11, 2025
07:54
In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen
Published on: September 20, 2012
13.7K
A Collagen Triple Helix without the Super Helical Twist
Mark A B Kreutzberger1, Le Tracy Yu2, Maria C Hancu2
1Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA, 22903, USA.
Biorxiv : the Preprint Server for Biology
|October 10, 2024
Summary
Researchers discovered a novel collagen triple helix conformation lacking superhelical twist. This finding reveals unique packing arrangements and expands our understanding of collagen assembly, crucial for extracellular matrix and immune complexes.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biology
Background:
- Collagens are vital structural proteins in the extracellular matrix and immune complexes.
- Limited understanding exists regarding the packing of collagen triple helices into larger assemblies.
Purpose of the Study:
- To investigate the structural basis of collagenous assembly formation.
- To explore novel triple helix conformations and their packing in collagen-like structures.
Main Methods:
- Utilized a peptide self-assembly system to create collagenous assemblies based on the C1q collagen-like region.
- Determined the structure of an assembly using cryo-electron microscopy (cryo-EM) at 3.5 Å resolution.
- Built an atomic model to analyze triple helix conformation and interactions.
Main Results:
- Identified a non-twisting triple helix conformation, differing from the canonical right-handed helix.
- Observed unique hydroxyproline stacking and a hydrophobic cavity formed by symmetrical amino acid packing.
- Designed and tested mutant assemblies, confirming the predicted stabilizing amino acid interactions.
Conclusions:
- Collagen and collagen-like assemblies exhibit a broader conformational diversity than previously assumed.
- Novel packing arrangements may occur at helix termini and sequence discontinuities.
- Findings have implications for understanding collagen-associated diseases.
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