Members of this family of transcriptional repressors adopt a T-shaped structure, with a core composed of two antiparallel alpha-helices. These proteins can be divided into two parts, a 'globular head' and an 'elongated tail', and they negatively regulate conjugation and the expression of tra genes by antagonising traR/AAI-dependent activation [1].

1: Crystal structure of the quorum-sensing protein TraM and its interaction with the transcriptional regulator TraR. Vannini A, Volpari C, Di Marco S; J Biol Chem. 2004;279:24291-24296. PMID:15044488