IFIT2
Domain
The C-terminal part folds into a super-helical structure and has an extensively positively-charged nucleotide-binding channel on its inner surface.
Function
IFN-induced antiviral protein which inhibits expression of viral messenger RNAs lacking 2'-O-methylation of the 5' cap. The ribose 2'-O-methylation would provide a molecular signature to distinguish between self and non-self mRNAs by the host during viral infection. Viruses evolved several ways to evade this restriction system such as encoding their own 2'-O-methylase for their mRNAs or by stealing host cap containing the 2'-O-methylation (cap snatching mechanism). Binds AU-rich viral RNAs, with or without 5' triphosphorylation, RNA-binding is required for antiviral activity. Can promote apoptosis.
Sequence Similarities
Belongs to the IFIT family.
Cellular localization
- Cytoplasm
- Endoplasmic reticulum
Alternative names
CIG-42, G10P2, IFI54, ISG54, IFIT2, Interferon-induced protein with tetratricopeptide repeats 2, IFIT-2, ISG-54 K, Interferon-induced 54 kDa protein, IFI-54K, P54