This family inactivates the repressor AbrB, which represses genes switched on during the transition from the exponential to the stationary phase of growth. It binds to AbrB and prevents it from binding to DNA [1].

1: Parallel pathways of repression and antirepression governing the transition to stationary phase in Bacillus subtilis. Banse AV, Chastanet A, Rahn-Lee L, Hobbs EC, Losick R; Proc Natl Acad Sci U S A. 2008;105:15547-15552. PMID:18840696