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Infect. Immun., 01 1998, 115-121, Vol 66, No. 1
T Oho, H Yu, Y Yamashita and T Koga
The interaction between a surface protein antigen (PAc) of Streptococcus
mutans and human salivary agglutinin was analyzed with a surface plasmon
resonance biosensor. The major component sugars of the salivary agglutinin
were galactose, fucose, mannose, N- acetylglucosamine,
N-acetylgalactosamine, and N-acetylneuraminic acid. Binding of salivary
agglutinin to PAc was calcium dependent and heat labile and required a pH
greater than 5. Binding was significantly inhibited by N-acetylneuraminic
acid and alpha2,6-linked sialic acid- specific lectin derived from Sambucus
sieboldiana in a dose-dependent manner. Pretreatment of the salivary
agglutinin with sialidase reduced the binding activity of the agglutinin to
the PAc molecule. The agglutinin was dissociated into high-molecular-mass
glycoprotein and secretory immunoglobulin A (sIgA) components by
electrophoretic fractionation in the presence of 1% sodium dodecyl sulfate
and 1% 2- mercaptoethanol. Neither of the components separated by
electrophoretic fractionation, high-molecular-mass glycoprotein or sIgA,
bound to the PAc molecule. Furthermore, the high-molecular-mass
glycoprotein strongly inhibited the binding of the native salivary complex
to PAc. These results suggest that the complex formed by the
high-molecular- mass salivary glycoprotein and sIgA is essential for the
binding reaction and that the sialic acid residues of the complex play an
important role in the interaction between the agglutinin and PAc of S.
mutans.
Copyright © 1998, American Society for Microbiology
Binding of salivary glycoprotein-secretory immunoglobulin A complex to the surface protein antigen of Streptococcus mutans
Department of Preventive Dentistry, Kyushu University Faculty of Dentistry, Fukuoka, Japan.
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