Streptococcus mutans plays an important role in the development of dental caries in humans by synthesizing adhesive insoluble glucans from sucrose by mutansucrase activity. To explore the anti-cariogenic characteristics of rubusoside (Ru), a natural sweetener component in Rubus suavissimus S. Lee (Rosaceae), we investigated the inhibitory effect of Ru against the activity of mutansucrase and the growth of Streptococcus mutans. Ru (50 mM) showed 97% inhibitory activity against 0.1 U/mL mutansucrase of S. mutans with 500 mM sucrose. It showed competitive inhibition with a Ki value of 1.1 ± 0.2 mM and IC50 of 2.3 mM. Its inhibition activity was due to hydrophobic and hydrogen bonding interactions based on molecular docking analysis. Ru inhibited the growth of S. mutans as a bacteriostatic agent, with MIC and MBC values of 6 mM and 8 mM, respectively. In addition, Ru showed synergistic anti-bacterial activity when it was combined with curcumin. Therefore, Ru is a natural anti-cariogenic agent with anti-mutansucrase activity and antimicrobial activity against S. mutans.
Bibliographical noteFunding Information:
This work was partially supported by the OTTOGI Corporation through the Research and Publication Project, by the Korean Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry, and Fisheries (IPET) through the Agriculture, Food and Rural Affairs Research Center Support Program, funded by the Ministry of Agriculture, Food, and Rural Affairs (MAFRA) (D. Kim, 710012-03-1-HD220), and by the Korean Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry, and Fisheries (IPET) through the High Value-added Food Technology Development Program (116013032HD020) funded by the Ministry of Agriculture, Food, and Rural Affairs, Republic of Korea. The present study has been also conducted under Indo-Korea joint research program of Department of Science and Technology, Government of India (Sanction order # INT/Korea/P-37, June 15, 2017) and under the framework of International Cooperation Program managed (2016K1A3A1A19945059), and by the Basic Science Research Program (2018R1D1A1B07049569, T.T.H. Nguyen, 2018R1C1B6006348, I. Mok, 2018R1D1A1A09083366, D. Kim) managed by the NRF, Republic of Korea.
© 2019, The Korean Society for Biotechnology and Bioengineering and Springer.
All Science Journal Classification (ASJC) codes
- Applied Microbiology and Biotechnology
- Biomedical Engineering