Immobilization of fructosyltransferase from Streptococcus mutans on hydroxyapatite surfaces induces the formation of multimeric complexes.
OBJECTIVE
To investigate the formation of fructosyltransferase (FTF) complexes on hydroxyapatite (HA) surfaces.


RESULTS
Cell-free extracellular FTF from Streptococcus mutans, purified from hyperproducing strain V-1995, was adsorbed onto HA and then eluted from the surface by means of a concentration gradient of potassium phosphate buffer. The FTF monomers loaded onto HA formed, upon adsorption, various complexes ranging from 200 to 700 kDa as demonstrated using native PAGE. All these complexes exhibited enzymatic activity.


CONCLUSIONS
Adsorption of FTF onto HA induced the formation of stable and enzymatically-active complexes.


CONCLUSIONS
The formation of these complexes may explain the change of FTF catalytic properties after adsorption onto HA. This study is another step in determining the properties of a-cellular constituents of the oral biofilm.
Bronshteyn
M
M
Department of Oral Biology, Faculty of Dentistry, Hebrew University-Hadassah, Jerusalem, Israel.
Steinberg
D
D
D001704:Biopolymers / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D004591:Electrophoresis, Polyacrylamide Gel; D006602:Hexosyltransferases / Q000737:chemistry*; D006801:Humans; D013295:Streptococcus mutans / Q000737:chemistry* / Q000201:enzymology*; D001426:Bacterial Proteins
D001704:Biopolymers; D017886:Durapatite; D006602:Hexosyltransferases; C021451:inulosucrase; D001426:Bacterial Proteins