Journal
JOURNAL OF STRUCTURAL BIOLOGY
Volume 207, Issue 2, Pages 104-114Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2019.04.014
Keywords
Biomineralization; Non-collagenous proteins; Mineral bound protein; Protein-mineral interface; Protein conformation; Apatite regulation; Solid state NMR
Funding
- United States -Israel Binational Science Foundation [2008409]
- Israel Science Foundation [1059/09]
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Non-collagenous proteins such as osteocalcin function as regulators of the mineralization process in bone. Osteocalcin undergoes post-translational modification adding an extra carboxylate group on three of its glutamate residues to enhance interaction with bone mineral. In this work, we examine regulation of biomimetic apatite formation by osteocalcin that was not modified after translation. We analyze the structural features in the protein and mineral-protein interfaces to elicit the unmodified protein's fold inside the mineral and to unveil the species that interact with the mineral surface. The results presented here give clues on the protein's active role in controlling the mineral phases that are formed on hydroxyapatite crystals and its ability to influence the extent of order in these crystals.
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