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Infect Immun. Sep 1991; 59(9): 2948–2954.
PMCID: PMC258118

Delineation of a segment of adsorbed salivary acidic proline-rich proteins which promotes adhesion of Streptococcus gordonii to apatitic surfaces.

Abstract

Cells of several strains of Streptococcus gordonii attached in much higher numbers to experimental pellicles formed from samples of submandibular or parotid saliva on hydroxyapatite (HA) beads than to buffer controls. The nature of the salivary components responsible were investigated by preparing experimental pellicles from chromatographic fractions of submandibular saliva obtained from Trisacryl GF 2000M columns. Adhesion of S. gordonii Blackburn was promoted by two groups of fractions. The adhesion-promoting activity in the first group of fractions was associated with the family of acidic proline-rich proteins (PRPs), while that of the second group is as yet unidentified. Experimental pellicles prepared by treating HA with 2 micrograms of pure 150-amino-acid-residue PRPs (PRP-1, PRP-2, and PIF-s) promoted adhesion of S. gordonii Blackburn cells to an extent comparable to that obtained with unfractionated saliva. However, pellicles prepared from a 106-residue PRP (PRP-3) were significantly less effective, and those prepared from the amino-terminal tryptic peptide (residues 1 to 30) of the PRP and the salivary phosphoprotein statherin were completely ineffective in promoting adhesion. Although adhesion of several strains of S. gordonii was promoted by adsorbed PRP-1, the adhesion of several strains of Streptococcus sanguis or Streptococcus oralis was either not affected or only weakly enhanced by this protein. S. gordonii cells bound avidly to PRPs adsorbed onto HA beads, but the streptococci did not appear to bind PRPs in solution, since concentrations of PRP as high as 200 micrograms/ml did not inhibit binding of bacterial cells to pellicles prepared from pure PRP. S. gordonii cells also attached well to PRP or a synthetic decapeptide representing residues 142 to 150 of the PRP when the peptide was linked to agarose beads. Studies with a series of synthetic decapeptides indicated that the minimal segment of PRP which promoted high levels of S. gordonii adhesion was the carboxy-terminal dipeptide Pro-Gln (residues 149 and 150).

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Selected References

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