MAN1 is an integral protein of the inner nuclear membrane which binds to chromatin associated proteins and plays a role in nuclear organisation. The C terminal nucleoplasmic region forms a DNA binding winged helix and binds to Smad [1]. This C-terminal tail is also found in S. cerevisiae and is thought to consist of three conserved helices followed by two downstream strands [2].

1: The carboxyl-terminal nucleoplasmic region of MAN1 exhibits a DNA binding winged helix domain. Caputo S, Couprie J, Duband-Goulet I, Konde E, Lin F, Braud S, Gondry M, Gilquin B, Worman HJ, Zinn-Justin S; J Biol Chem. 2006;281:18208-18215. PMID:16648637

2: Comparative genomics, evolution and origins of the nuclear envelope and nuclear pore complex. Mans BJ, Anantharaman V, Aravind L, Koonin EV; Cell Cycle. 2004;3:1612-1637. PMID:15611647