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    Eur J Biochem. 1999 Apr;261(2):509-17.

    Identification of a novel human adenylate kinase. cDNA cloning, expression analysis, chromosome localization and characterization of the recombinant protein.

    Van Rompay AR, Johansson M, Karlsson A.

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    Division of Clinical Virology, Karolinska Institute, Huddinge University Hospital, Stockholm, Sweden.

    Abstract

    Adenylate kinases have an important role in the synthesis of adenine nucleotides that are required for cellular metabolism. We report the cDNA cloning of a novel 22-kDa human enzyme that is sequence related to the human adenylate kinases and to UMP/CMP kinase of several species. The enzyme was expressed in Escherichia coli and shown to catalyse phosphorylation of AMP and dAMP with ATP as phosphate donor. When GTP was used as phosphate donor, the enzyme phosphorylated AMP, CMP, and to a small extent dCMP. Expression as a fusion protein with the green fluorescent protein showed that the enzyme is located in the cytosol. Northern blot analysis with mRNA from eight different human tissues demonstrated that the enzyme was expressed exclusively in brain, with two mRNA isoforms of 2.4 and 4.0 kb. The gene that encoded the enzyme was localized to chromosome 1p31. Based on the substrate specificity and the sequence similarity with the previously identified human adenylate kinases, we have named this novel enzyme adenylate kinase 5.

    PMID:
    10215863
    [PubMed - indexed for MEDLINE]
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