Inhibition of Streptococcus mutans biofilm formation by Streptococcus salivarius FruA.
The oral microbial flora consists of many beneficial species of bacteria that are associated with a healthy condition and control the progression of oral disease. Cooperative interactions between oral streptococci and the pathogens play important roles in the development of dental biofilms in the oral cavity. To determine the roles of oral streptococci in multispecies biofilm development and the effects of the streptococci in biofilm formation, the active substances inhibiting Streptococcus mutans biofilm formation were purified from Streptococcus salivarius ATCC 9759 and HT9R culture supernatants using ion exchange and gel filtration chromatography. Matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry analysis was performed, and the results were compared to databases. The S. salivarius HT9R genome sequence was determined and used to indentify candidate proteins for inhibition. The candidates inhibiting biofilms were identified as S. salivarius fructosyltransferase (FTF) and exo-beta-d-fructosidase (FruA). The activity of the inhibitors was elevated in the presence of sucrose, and the inhibitory effects were dependent on the sucrose concentration in the biofilm formation assay medium. Purified and commercial FruA from Aspergillus niger (31.6% identity and 59.6% similarity to the amino acid sequence of FruA from S. salivarius HT9R) completely inhibited S. mutans GS-5 biofilm formation on saliva-coated polystyrene and hydroxyapatite surfaces. Inhibition was induced by decreasing polysaccharide production, which is dependent on sucrose digestion rather than fructan digestion. The data indicate that S. salivarius produces large quantities of FruA and that FruA alone may play an important role in multispecies microbial interactions for sucrose-dependent biofilm formation in the oral cavity.
Department of Bacteriology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
Ayako
A
Ogawa
Soichi
S
Furukawa
Shuhei
S
Fujita
Jiro
J
Mitobe
Taketo
T
Kawarai
Naoki
N
Narisawa
Tsuyoshi
T
Sekizuka
Makoto
M
Kuroda
Kuniyasu
K
Ochiai
Hirokazu
H
Ogihara
Saori
S
Kosono
Saori
S
Yoneda
Haruo
H
Watanabe
Yasushi
Y
Morinaga
Hiroshi
H
Uematsu
Hidenobu
H
Senpuku
D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D001234:Aspergillus niger / Q000201:enzymology; D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development; D002850:Chromatography, Gel; D005656:Fungal Proteins / Q000302:isolation & purification / Q000378:metabolism; D006026:Glycoside Hydrolases / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D006602:Hexosyltransferases / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D009548:Niger; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013295:Streptococcus mutans / Q000187:drug effects* / Q000254:growth & development; D013395:Sucrose / Q000378:metabolism
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D005656:Fungal Proteins; D013395:Sucrose; D006602:Hexosyltransferases; C021451:inulosucrase; D006026:Glycoside Hydrolases; C044118:fructan beta-fructosidase
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