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A consensus model for molecular packing of type I collagen
T J Wess1, A P Hammersley, L Wess
1Department of Biological and Molecular Sciences, University of Stirling, Stirling, FK9 4LA, United Kingdom.
Journal of Structural Biology
|September 2, 1998
Summary
X-ray diffraction reveals the molecular packing of type I collagen in tendon fibrils. A new model of a 1D staggered microfibril explains collagen structure and packing, aiding future research.
Area of Science:
- Biophysics
- Structural Biology
- Biochemistry
Background:
- Type I collagen is the primary structural protein in tendons.
- Understanding collagen's molecular packing is crucial for tendon biomechanics.
- Previous models lacked detailed molecular packing information.
Purpose of the Study:
- To elucidate the molecular packing of type I collagen in tendon fibrils using X-ray diffraction data.
- To propose a novel model for collagen microfibril structure.
- To correlate structural findings with existing biomechanical and biochemical evidence.
Main Methods:
- Analysis of recent X-ray diffraction studies on tendon.
- Development of a molecular packing model based on diffraction data.
- Comparison of the proposed model with mineralization, crosslinking, and biomechanical data.
Main Results:
- Defined the unit cell as triclinic.
- Proposed a 1D staggered left-handed microfibril model.
- Identified interconnections between microfibrils based on telopeptide orientation.
Conclusions:
- The proposed microfibril model provides the first absolute molecular packing definition from X-ray diffraction.
- The model aligns with various structural and biochemical criteria.
- This structure offers a basis for a consensus model of collagen packing.