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Fibrous and Helical Calcite Crystals Induced by Synthetic Polypeptides Containing O ‐Phospho‐ L ‐Serine and O ‐Phospho‐ L ‐Threonine
Author(s) -
Hayashi Shinya,
Ohkawa Kousaku,
Suwa Yukie,
Sugawara Tetsunori,
Asami Takahiro,
Yamamoto Hiroyuki
Publication year - 2008
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200700096
Subject(s) - calcite , vaterite , chemistry , crystallography , calcium carbonate , stereochemistry , mineralogy , aragonite , organic chemistry
The modification of CaCO 3 crystal growth by synthetic L ‐Ser(PO 3 H 2 ) and L ‐Thr(PO 3 H 2 ) containing polypeptides is described. The amino acids Gly, L ‐Glu, L ‐Asp, L ‐Ser, L ‐Ala, and L ‐Lys induced rhombohedral calcite with a rough surface. Dipeptides, Xaa‐ L ‐Ser(PO 3 H 2 ) (Xaa = Gly, L ‐Glu, L ‐Asp, L ‐Ser, L ‐Ala and L ‐Lys) induced vaterite crystals in the lower [Ca 2+ ]. On the other hand, L ‐Ser(PO 3 H 2 )‐containing polypeptides formed spherical vaterite and fibrous calcite. The characteristic helical calcite was found in the presence of copoly[ L ‐Ser(PO 3 H 2 ) 75 L ‐Asp 25 ] or poly[ L ‐Ser(PO 3 H 2 ) 3 – L ‐Asp]. Fibrous calcite, spherical vaterite, and helical calcite crystals were subjected to XRD and EDX analysis. XRD revealed the specific faces of these crystals. EDX spectra and surface analysis visualized the localization of the polypeptides and CaCO 3 components. Together with TEM and SAED data, we propose hypothetical growth mechanisms for the fibrous and helical calcite crystals.