A1 Journal article – refereed
Lactoperoxidase inhibits glucosyltransferases from Streptococcus mutans in vitro




List of Authors: Korpela A, Yu X, Loimaranta V, Lenander-Lumikari M, Vacca-Smith A, Wunder D, Bowen WH, Tenovuo J
Journal: Caries Research
Journal name in source: Caries research
Journal acronym: Caries Res
Volume number: 36
Issue number: 2
ISSN: 0008-6568

Abstract
This study examines the possible effect of the antimicrobial peroxidase system on the activity of streptococcal glucosyltransferases B, C and D (GtfB, GtfC and GtfD), either in solution (GtfB and GtfC) or when adsorbed to hydroxyapatite (GtfC and GtfD) at pH 6.5. The lactoperoxidase (LP) system (LP, H(2)O(2), SCN(-)) had no effect on the activity of dissolved GtfC, but the activity of dissolved GtfB was enhanced. The LP system, however, strongly inhibited the activities of both GtfC and GtfD in their adsorbed form. LP enzyme, without its substrates, inhibited all three Gtf enzymes: GtfB and GtfC in concentrations between 10 and 100 microg/ml in liquid phase and adsorbed GtfC and GtfD in concentrations between 25 and 50 microg/ml. This inhibition was in part abolished in liquid phase, but not in solid phase, if the substrates of LP were added. This study shows that the lactoperoxidase system can exert inhibitory activity against streptococcal Gtfs without generating oxidizing agents.

Last updated on 2019-21-08 at 21:29