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Published on: June 23, 2018
Effect of 3-hydroxyproline residues on collagen stability
Cara L Jenkins1, Lynn E Bretscher, Ilia A Guzei
1Contribution from the Department of Chemistry and Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
The study reveals that 3-hydroxy-l-proline (3-Hyp) can destabilize collagen triple helices, unlike 4-hydroxy-l-proline (4-Hyp). Its position within the collagen sequence significantly impacts this destabilizing effect on protein stability.
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Collagen, a fibrous protein, is crucial for connective tissues and features a triple-helical structure with repeating amino acid sequences.
- 4(R)-hydroxy-l-proline (4-Hyp) enhances collagen triple-helix stability.
- The effect of 3(S)-hydroxy-l-proline (3-Hyp) on collagen stability is largely unknown.
Purpose of the Study:
- To investigate the impact of 3-hydroxy-l-proline (3-Hyp) on collagen triple-helical stability.
- To compare the effects of 3-Hyp in natural (Xaa) and non-natural (Yaa) positions within the collagen sequence.
Main Methods:
- Synthesis of two host-guest peptides incorporating 3-Hyp at different positions.
- Analysis of the conformational stability of these synthesized peptides.
Main Results:
- Both synthesized peptides with 3-Hyp showed diminished triple-helical stability compared to proline.
- 3-Hyp in the natural Xaa position caused minor destabilization by weakening interstrand hydrogen bonds.
- 3-Hyp in the non-natural Yaa position resulted in significant destabilization due to pyrrolidine ring pucker and steric clashes.
Conclusions:
- 3-Hyp has distinct effects on collagen triple-helix stability compared to 4-Hyp.
- The position of 3-Hyp (Xaa vs. Yaa) critically determines its impact on collagen stability.
- Natural collagen sequences likely avoid the Yaa position for 3-Hyp to maintain structural integrity.
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