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    FEBS Lett. 1999 Apr 1;448(1):185-9.

    Molecular cloning and characterization of human AOS1 and UBA2, components of the sentrin-activating enzyme complex.

    Gong L, Li B, Millas S, Yeh ET.

    Source

    Research Center for Cardiovascular Diseases, Institute of Molecular Medicine for the Prevention of Human Diseases, University of Texas-Houston Health Science Center, 77030, USA.

    Abstract

    Sentrin-1/SUMO-1 is a novel ubiquitin-like protein, which can covalently modify a limited number of cellular proteins. Here we report the identification of the sentrin-activating enzyme complex, which consists of two proteins AOS1 and UBA2. Human AOS1 is homologous to the N-terminal half of E1, whereas human UBA2 is homologous to the C-terminal half of E1. The human UBA2 gene is located on chromosome 19q12. Human UBA2 could form a beta-mercaptoethanol-sensitive conjugate with members of the sentrin family, but not with ubiquitin of NEDD8, in the presence of AOS1. Identification of human UBA2 and AOS1 should allow a more detailed analysis of the enzymology of the activation of ubiquitin-like proteins.

    PMID:
    10217437
    [PubMed - indexed for MEDLINE]

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