BACKGROUND/AIMS: Studies of trace metals in drinking water and tooth enamel have suggested a caries-promoting potential for manganese (Mn). Additionally, Mn has been shown to be essential for the expression of mutans streptococci virulence factors such as the glucan-binding lectin (GBL) of Streptococcus sobrinus. The Streptococcus mutans glucan-binding protein (Gbp) GbpC is the functional analogue of the S. sobrinus GBL. S. mutans Gbps have been shown to contribute to biofilm architecture and virulence. This study was undertaken to examine the effects of Mn on the transcription of genes encoding S. mutans Gbps, including gbpC, along with other critical S. mutans virulence genes. METHODS: Microarray analyses suggested the potential for an Mn effect on Gbp genes. Further investigation of the Mn effects on selected genes was undertaken by performing Northern blots, Western blots, and RT-PCR under conditions of planktonic and biofilm growth in Mn-depleted media or in media containing 50 mircoM Mn. RESULTS: Mn resulted in increased expression of gbpC and gtfB, and decreased expression of wapA, in both planktonic and biofilm cultures. The expression levels of gbpA and gbpD were also decreased in the presence of Mn, but only in biofilms. The expression of gtfC was increased in the presence of Mn only in planktonic cultures. The spaP gene was expressed more highly in Mn-supplemented planktonic cultures but less in Mn-supplemented biofilms. CONCLUSION: Mn availability affects the expression of multiple S. mutans genes involved in adhesion and biofilm formation. Furthermore, these effects depend on the growth state of the organism. (c) 2007 S. Karger AG, Basel
BACKGROUND/AIMS: Studies of trace metals in drinking water and tooth enamel have suggested a caries-promoting potential for manganese (Mn). Additionally, Mn has been shown to be essential for the expression of mutans streptococci virulence factors such as the glucan-binding lectin (GBL) of Streptococcus sobrinus. The Streptococcus mutans glucan-binding protein (Gbp) GbpC is the functional analogue of the S. sobrinus GBL. S. mutans Gbps have been shown to contribute to biofilm architecture and virulence. This study was undertaken to examine the effects of Mn on the transcription of genes encoding S. mutans Gbps, including gbpC, along with other critical S. mutans virulence genes. METHODS: Microarray analyses suggested the potential for an Mn effect on Gbp genes. Further investigation of the Mn effects on selected genes was undertaken by performing Northern blots, Western blots, and RT-PCR under conditions of planktonic and biofilm growth in Mn-depleted media or in media containing 50 mircoM Mn. RESULTS: Mn resulted in increased expression of gbpC and gtfB, and decreased expression of wapA, in both planktonic and biofilm cultures. The expression levels of gbpA and gbpD were also decreased in the presence of Mn, but only in biofilms. The expression of gtfC was increased in the presence of Mn only in planktonic cultures. The spaP gene was expressed more highly in Mn-supplemented planktonic cultures but less in Mn-supplemented biofilms. CONCLUSION: Mn availability affects the expression of multiple S. mutans genes involved in adhesion and biofilm formation. Furthermore, these effects depend on the growth state of the organism. (c) 2007 S. Karger AG, Basel
Authors: Robert D Perry; Susannah K Craig; Jennifer Abney; Alexander G Bobrov; Olga Kirillina; Ildefonso Mier; Helena Truszczynska; Jacqueline D Fetherston Journal: Microbiology Date: 2012-01-05 Impact factor: 2.777
Authors: Hsing-Ju Wu; Kate L Seib; Yogitha N Srikhanta; Jennifer Edwards; Stephen P Kidd; Tina L Maguire; Amanda Hamilton; Kuan-Tin Pan; He-Hsuan Hsiao; Chen-Wen Yao; Sean M Grimmond; Michael A Apicella; Alastair G McEwan; Andrew H-J Wang; Michael P Jennings Journal: J Proteomics Date: 2009-12-11 Impact factor: 4.044
Authors: Megan L Falsetta; Marlise I Klein; José A Lemos; Bruno B Silva; Senyo Agidi; Kathy K Scott-Anne; Hyun Koo Journal: Antimicrob Agents Chemother Date: 2012-09-17 Impact factor: 5.191
Authors: Kevin P O'Rourke; Jeremy D Shaw; Mitchell W Pesesky; Brian T Cook; Susanne M Roberts; Jeffrey P Bond; Grace A Spatafora Journal: J Bacteriol Date: 2009-11-13 Impact factor: 3.490
Authors: Paul A Cobine; Luisa F Cruz; Fernando Navarrete; Daniel Duncan; Melissa Tygart; Leonardo De La Fuente Journal: PLoS One Date: 2013-01-22 Impact factor: 3.240