Mga is a DNA-binding protein that activates the expression of several important virulence genes in group A streptococcus in response to changing environmental conditions [1]. This corresponds to the PRD like region.

1: Two DNA-binding domains of Mga are required for virulence gene activation in the group A streptococcus. McIver KS, Myles RL; Mol Microbiol 2002;43:1591-1601. PMID:11952907