This is a cytoskeletal protein exclusively expressed in oligodendrocytes [1] that plays a role in cytoskeletal rearrangements during the late wrapping and/or compaction phases of myelinogenesis and in maintenance and stability of myelin sheath in the adult. It may also play an important role in late-stage oligodendroglia maturation, myelin/Ranvier node formation during CNS development, and in the maintenance and plasticity of related structures in the mature CNS [1,2]. Ermin associates with the myosin phosphatase Rho interacting protein protein (Mprip/p116RIP) and inactivates RhoA, a GTPase that controls cytoskeletal rearrangement in differentiating cells, thus contributing to oligodendrocyte morphogenesis [2]. It has a C-terminal actin-binding domain similar to those of members of the ERM family but lacks the conserved N-terminal FERM domain [2].

1: Ermin, a myelinating oligodendrocyte-specific protein that regulates cell morphology. Brockschnieder D, Sabanay H, Riethmacher D, Peles E; J Neurosci. 2006;26:757-762. PMID:16421295

2: Ermin is a p116(RIP) -interacting protein promoting oligodendroglial differentiation and myelin maintenance. Wang S, Wang T, Liu T, Xie RG, Zhao XH, Wang L, Yang Q, Jia LT, Han J; Glia. 2020;68:2264-2276. PMID:32530539