This family represents a number of fimbrial protein transcription regulators found in Gram-negative bacteria. These proteins are thought to facilitate binding of the leucine-rich regulatory protein to regulatory elements, possibly by inhibiting deoxyadenosine methylation of these elements by deoxyadenosine methylase [1,2].

1: Negative control of fae (K88) expression by the 'global' regulator Lrp is modulated by the 'local' regulator FaeA and affected by DNA methylation. Huisman TT, de Graaf FK; Mol Microbiol 1995;16:943-953. PMID:7476191

2: Differential binding of Lrp to two sets of pap DNA binding sites mediated by Pap I regulates Pap phase variation in Escherichia coli. Nou X, Braaten B, Kaltenbach L, Low DA; EMBO J 1995;14:5785-5797. PMID:8846772