This family is a short coiled-coil interaction region on the transcriptional repressors P66A and P66B. The P66A and B, or alpha and beta, complex with MBDs or methyl-binding domain-containing proteins via a coiled-coil region on each. This P66-MBD2 complex forms part of an assembly with NuRD, nucleosome remodelling and deacetylation protein. MBD2-NuRD binds methylated DNA and regulates transcription of eg, the foetal beta-globin gene during development [1].

1: p66Alpha-MBD2 coiled-coil interaction and recruitment of Mi-2 are critical for globin gene silencing by the MBD2-NuRD complex. Gnanapragasam MN, Scarsdale JN, Amaya ML, Webb HD, Desai MA, Walavalkar NM, Wang SZ, Zu Zhu S, Ginder GD, Williams DC Jr; Proc Natl Acad Sci U S A. 2011;108:7487-7492. PMID:21490301