Found in the DNRI/REDD/AFSR family of regulators. This region of AFSR (Swiss:P25941) along with the C terminal region is capable of independently directing actinorhodin production. This family contains TPR repeats.

1: New Knowledge from Old: In silico discovery of novel protein domains in Streptomyces coelicolor. Yeats C, Bentley S, Bateman A; BMC Microbiol 2003;3:3-3. PMID:12625841