This domain corresponds to the Intramolecular Chaperone Auto-processing (ICA) domain of myelin regulatory factor (Myrf) located at its C-terminal and belongs to the Peptidase S74 family. It forms a homo-trimer and carries out the auto-cleavage of Myrf releasing the Myrf N-terminal homo-trimer from the ER membrane. This allows its entry to the nucleus to function as a homo-trimer transcription factor [1,2].

1: Myelin gene regulatory factor is a critical transcriptional regulator required for CNS myelination. Emery B, Agalliu D, Cahoy JD, Watkins TA, Dugas JC, Mulinyawe SB, Ibrahim A, Ligon KL, Rowitch DH, Barres BA; Cell. 2009;138:172-185. PMID:19596243

2: Functional mechanism and pathogenic potential of MYRF ICA domain mutations implicated in birth defects. An H, Fan C, Sharif M, Kim D, Poitelon Y, Park Y; Sci Rep. 2020;10:814. PMID:31964908