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Quantification of the binding affinity of a specific hydroxyapatite binding peptide
Michael C Weiger1, Jung Jin Park, Marc D Roy
1Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Biomaterials
|January 29, 2010
Summary
Researchers identified a peptide that binds to hydroxyapatite (HA), a key mineral in bones and teeth. This study quantifies the peptide-HA binding affinity, revealing specific amino acid contributions to this crucial interaction for biomineralization.
Area of Science:
- Biomineralization
- Materials Science
- Biochemistry
Background:
- Bone and teeth formation involves precise hydroxyapatite (HA) nucleation and crystallization.
- Peptides play a role in controlling HA mineralization, microstructure, and nucleation.
- A specific peptide identified via phage display binds to crystalline HA and tooth-derived HA domains.
Purpose of the Study:
- To quantitatively measure the binding affinity of a specific peptide to hydroxyapatite (HA).
- To investigate the contribution of specific amino acid fragments within the peptide to HA binding.
- To understand the synergistic effects of peptide moieties on HA interaction.
Main Methods:
- Utilized a microfluidic chip-based surface plasmon resonance imaging (SPRi) technique.
- Fabricated a novel 4-layer HA sensor for quantitative affinity measurements.
- Analyzed the binding characteristics of the full peptide and its constituent fragments (SVSV, MKPSP).
Main Results:
- The peptide (SVSVGMKPSPRPGGGK) exhibited a high binding affinity to HA (K(D) = 14.1 µM ± 3.8 µM).
- The SVSV amino acid fragment significantly contributed to the peptide-HA interaction.
- The MKPSP fragment enhanced affinity through conformational dependence, but showed limited specificity alone.
Conclusions:
- The identified peptide demonstrates significant binding affinity to hydroxyapatite.
- Specific amino acid sequences within the peptide are critical for HA interaction.
- Synergistic binding between peptide moieties enhances interaction with HA, relevant for biomineralization control.
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