Summary
Calcium-phospholipid-phosphate complexes (Ca-PL-P) were isolated from calcified and uncalcifiedBacterionema matruchotii and its calcified lipid extracts. Similar complexes were absent from the noncalcifying bacteriumActinomyces naeslundii. The majority of the Ca-PL-P complexes were associated with the proteolipid acidic phospholipid component. Ca-PL-P complexes isolated fromB. matruchotii and from calcified proteolipid contained phosphatidylinositol, phosphatidylinositol-4-phosphate, phosphatidylinositol-4,5-diphosphate, and phosphatidylserine. They consisted of approximately 52 mole % Ca, 32 mole % organic P, and 15 mole % Pi. During Ca-PL-P extraction fromB. matruchotii or its proteolipid-containing calcified lipid extracts, the proteolipid was dissociated and the apoprotein precipitated as fluff at the aqueous-organic solvent interface, thus explaining the failure to detect protein in Ca-PL-P preparations. When the ability of Ca-PL-P complexes and lipid fractions ofB. matruchotii to initiate apatite formation from metastable calcium phosphate solution was compared, the yield of hydroxyapatite decreased as follows: Ca-PL-P > proteolipid acidic phospholipids > proteolipid > crude phospholipid > total lipids > whole cells.
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Boyan-Salyers, B.D., Boskey, A.L. Relationship between proteolipids and calcium-phospholipid-phosphate complexes inBacterionema matruchotii calcification. Calcif Tissue Int 30, 167–174 (1980). https://doi.org/10.1007/BF02408622
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DOI: https://doi.org/10.1007/BF02408622