This family contains the small molecule binding domain of a number of different bacterial transcription activators [1]. This family also contains DNA gyrase inhibitors. The GyrI superfamily contains a diad of the SHS2 module, adapted for small-molecule binding [3]. The GyrI superfamily includes a family of secreted forms that is found only in animals and the bacterial pathogen Leptospira [3].

1: Crystal structure of the Escherichia coli Rob transcription factor in complex with DNA. Kwon HJ, Bennik MH, Demple B, Ellenberger T; Nat Struct Biol 2000;7:424-430. PMID:10802742

2: Crystal structure of the Escherichia coli SbmC protein that protects cells from the DNA replication inhibitor microcin B17. Romanowski MJ, Gibney SA, Burley SK; Proteins 2002;47:403-407. PMID:11948793

3: The SHS2 module is a common structural theme in functionally diverse protein groups, like Rpb7p, FtsA, GyrI, and MTH1598/TM1083 superfamilies. Anantharaman V, Aravind L; Proteins. 2004;56:795-807. PMID:15281131