Fig. 2. Merlin structure and interactions. (A) Merlin contains three conserved
protein-protein interaction domains: a FERM domain in its N-terminus and a
C-terminal domain (CTD) separated by a coiled-coil (
-helical) region.
Crystallography showed that the merlin FERM domain contains three subdomains,
which exhibits a cloverleaf architecture. Merlin FERM has a unique `Blue Box'
(BB, residues 177-183) compared with other ERM proteins. (B) Merlin can adopt
two conformations: a `closed' active and `open' inactive form. Merlin can
switch from these two conformations as a result of phosphorylation, lipid
binding, protein interactions or NF2 mutations. (C) Merlin interacts
with several molecules, including NHE-RF, ßII-spectrin, CD44, other ERM
proteins, SCHIP-1, HRS, actin and syntenin, which may affect merlin function
as a growth suppressor. The proposed domains in merlin that mediate these
interactions are depicted.