Figure 4 | International Journal of Oral Science

Figure 4

From: Alanine racemase is essential for the growth and interspecies competitiveness of Streptococcus mutans

Figure 4

Effect of conditioned medium derived from other commensal bacteria on the growth of the alr mutant. (a, b) Effect of S. sanguinis-derived and S. gordonii-derived conditioned medium on the growth of the Δalr with or without exogenous D-Ala, respectively. (c, d) Effect of S. sanguinis-derived and S. gordonii-derived conditioned medium supplemented with D-AA oxidase on the growth of Δalr. The results were averaged from three independent experiments and presented as the mean±standard deviation. “sn”: supernatant from S. sanguinis or S. gordonii culture; “1:2 sn”: 1:2 diluted supernatant with fresh BHI broth media. AA, amino acid; Ala, alanine; Δalr, S. mutans alr mutant; BHI, brain heart infusion.

Back to article page