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  • Title: Mechanistic insight into site-restricted monoubiquitination of FANCD2 by Ube2t, FANCL, and FANCI.
    Author: Alpi AF, Pace PE, Babu MM, Patel KJ.
    Journal: Mol Cell; 2008 Dec 26; 32(6):767-77. PubMed ID: 19111657.
    Abstract:
    A key step in the Fanconi anemia (FA) tumor suppressor pathway is the site-specific monoubiquitination of the FANCD2 protein. Genetic studies indicate that this crucial modification requires eight known FA gene products and the E2-conjugating enzyme Ube2t. Here, we minimally reconstitute this monoubiquitination reaction with Ube2t and the FANCL protein, revealing that monoubiquitination is stimulated by a conserved RWD-like domain in FANCL. Furthermore, addition of the FANCI protein enhances monoubiquitination and also restricts it to the in vivo substrate lysine residue on FANCD2. This work therefore establishes a system that provides mechanistic insight into the functions of FANCL and FANCI in the catalysis of FANCD2 monoubiquitination.
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