Ermin (ERMN)

Ermin (ERMN) is a cytoskeletal, F-actin-binding protein expressed specifically and selectively in oligodendrocytes of the central nervous system[1][2][3]. Unlike canonical ERM (ezrin, radixin, moesin) proteins, Ermin lacks the N-terminal FERM domain but retains a C-terminal actin-binding segment highly similar to that found in ERM proteins[1][3]. It appears during the late stages of oligodendrocyte differentiation and is localized to the tips of F-actin-rich processes ("Ermin spikes"), the outer cytoplasmic lip of the myelin sheath, and paranodal loops[1]. Ermin regulates cytoskeletal rearrangements vital for myelination, likely contributing to process extension and morphological changes in oligodendrocytes[1]. The only validated binding partner is F-actin; Ermin does not interact with G-actin and does not exhibit direct effects on actin polymerization beyond mild inhibition[3]. Its selective expression makes Ermin a valuable marker for mature oligodendrocytes and CNS myelination, but there is no conclusive evidence associating Ermin directly with any drug targeting or well-established disease mechanisms[1][2][3].

Other names

ErminERMNJuxtanodinKIAA1189JNERM-like protein