This family represents a transcriptional cell cycle regulator (TrcR) found in Proteobacteria, mainly Alphaproteobacteria. It has been shown to associate with promoters and coding sequences in vivo in a rifampicin-dependent manner and to interact physically and genetically with RNA polymerase, resulting in the integration of cell cycle and antibiotic stress control with the general transcriptional machinery [1].

1: The DUF1013 protein TrcR tracks with RNA polymerase to control the bacterial cell cycle and protect against antibiotics. Delaby M, Varesio LM, Degeorges L, Crosson S, Viollier PH; Proc Natl Acad Sci U S A. 2021; [Epub ahead of print] PMID:33602809