The protein encoded by this gene is a ubiquitin-like protein that is conjugated to intracellular target proteins upon activation by interferon-alpha and interferon-beta. Several functions have been ascribed to the encoded protein, including chemotactic activity towards neutrophils, direction of ligated target proteins to intermediate filaments, cell-to-cell signaling, and antiviral activity during viral infections. While conjugates of this protein have been found to be noncovalently attached to intermediate filaments, this protein is sometimes secreted.,ISG15,G1P2,IFI15,IMD38,IP17,UCRP,hUCRP,Epigenetics & Nuclear Signaling,Cell Biology & Developmental Biology,Ubiquitin,ISG15