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Hydroxyapatite surface-induced peptide folding.

Lisa A Capriotti¹, Thomas P Beebe, Joel P Schneider

¹Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.

Journal of the American Chemical Society

|April 3, 2007

Summary

Researchers designed a peptide, JAK1, that folds upon binding to hydroxyapatite (HA) surfaces. This controlled folding, driven by specific amino acid sequences, opens new avenues in biomaterial design and peptide engineering.

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Area of Science:

Biomaterials Science
Peptide Design
Surface Chemistry

Background:

Designing peptides with specific functions is crucial for advanced biomaterials.
Controlling peptide structure and behavior at interfaces remains a challenge.
Hydroxyapatite (HA) is a key mineral in biological systems, offering unique surface properties.

Purpose of the Study:

To design and characterize a de novo peptide (JAK1) that folds upon interaction with hydroxyapatite (HA).
To investigate the role of gamma-carboxyglutamic acid (Gla) residues in HA-induced peptide folding.
To quantify the binding affinity and surface coverage of JAK1 on HA.

Main Methods:

De novo peptide design incorporating periodic Gla residues.
Circular dichroism (CD) spectroscopy to assess secondary structure in solution and on HA.
Analytical ultracentrifugation to determine solution behavior.
Adsorption isotherms and X-ray photoelectron spectroscopy (XPS) to characterize surface binding.

Main Results:

JAK1 is unstructured in buffered saline but adopts a helical structure upon binding to HA.
The peptide exhibits strong binding to HA with a dissociation constant (Kd) of 310 nM.
Adsorption isotherms and XPS indicate JAK1 forms a self-limiting monolayer on the HA surface.
Periodic Gla positioning governs the HA-induced folding mechanism.

Conclusions:

HA surfaces can effectively trigger intramolecular folding of designed peptides.
This study provides foundational design rules for HA-induced peptide folding.
The findings pave the way for developing novel peptide-based biomaterials and surface functionalization strategies.