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    Genes Dev. 2007 Feb 1;21(3):255-60.

    ISG15 modification of the eIF4E cognate 4EHP enhances cap structure-binding activity of 4EHP.

    Okumura F, Zou W, Zhang DE.

    Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA.

    The expression of the ubiquitin-like molecule ISG15 and protein modification by ISG15 (ISGylation) are strongly activated by interferon, genotoxic stress, and pathogen infection, suggesting that ISG15 plays an important role in innate immune responses. 4EHP is an mRNA 5' cap structure-binding protein and acts as a translation suppressor by competing with eIF4E for binding to the cap structure. Here, we report that 4EHP is modified by ISG15 and ISGylated 4EHP has a much higher cap structure-binding activity. These data suggest that ISGylation of 4EHP may play an important role in cap structure-dependent translation control in immune responses.

    PMID: 17289916 [PubMed - indexed for MEDLINE]

    PMCID: 1785121

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