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Energetic basis for the molecular-scale organization of bone #MMPMID25540415
Tao J; Battle KC; Pan H; Salter EA; Chien YC; Wierzbicki A; De Yoreo JJ
Proc Natl Acad Sci U S A 2015[Jan]; 112 (2): 326-31 PMID25540415show ga
The remarkable mechanical properties of bone are determined by the organization and strength of binding at the mineral?collagen interface. Although the process through which collagen becomes mineralized has been extensively studied, little is known about the mechanisms or energetics that underlie the organization of this mineral?matrix composite. Combining molecular-scale imaging and analyses of collagen adsorption on four bone-related calcium phosphate phases, single-molecule force measurements and molecular simulations of collagen binding to hydroxyapatite, and electron microscopy analyses of bone and dentine, we determine the magnitude and chemistry of collagen?hydroxyapatite binding and show that calcium-deficient apatite is the only phase consistent with observed structural relationships.