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Updated: Jun 2, 2026

Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides
Published on: January 31, 2014
Interstrand dipole-dipole interactions can stabilize the collagen triple helix
Matthew D Shoulders1, Ronald T Raines
1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Collagen stability is enhanced by specific proline derivatives, particularly (2S,4R)-4-hydroxyproline (Hyp), in the Xaa position. Interstrand dipole-dipole interactions explain the hyperstability of GlyHypHyp collagen sequences.
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Collagen triple helix stability is typically governed by proline (Pro) and hydroxyproline (Hyp) positioning.
- A prevailing model suggests specific ring puckering preferences for Pro and its derivatives in the Xaa and Yaa positions for stable helices.
Purpose of the Study:
- To investigate the basis for the hyperstability of collagen sequences containing (2S,4R)-4-hydroxyproline (Hyp) in the Xaa position.
- To elucidate the physicochemical determinants of enhanced collagen triple helix stability.
Main Methods:
- Synthesis and analysis of collagen triple helices with varied C(γ)-exo-puckered proline derivatives.
- Comparative stability analysis of sequences like (GlyHypHyp)(n) versus (GlyProHyp)(n).
Main Results:
- Sequences with Hyp in the Xaa position exhibit hyperstability.
- The (GlyHypHyp)(n) sequence forms a more stable triple helix than (GlyProHyp)(n).
- Interstrand dipole-dipole interactions were identified as the primary factor contributing to this enhanced stability.
Conclusions:
- The study challenges existing paradigms of collagen stability.
- Interstrand dipole-dipole interactions provide a new framework for understanding collagen hyperstability.
- Findings offer insights into the structural and functional roles of proline derivatives in collagen.
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