cDNA cloning, genomic structure and chromosomal localization of the human BUP-1 gene encoding beta-ureidopropionase. |
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| Authors: | P Vreken A B van Kuilenburg N Hamajima R Meinsma H van Lenthe G G?hlich-Ratmann B E Assmann R A Wevers A H van Gennip |
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| Institution: | Academic Medical Center, Departments of Clinical Chemistry and Division Emma Children's Hospital, Amsterdam, Netherlands. p.vreken@amc.uva.nl |
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| Abstract: | A full-length cDNA clone encoding human beta-ureidopropionase was isolated. A 1152-nucleotide open reading frame which corresponds to a protein of 384 amino acids with a calculated molecular weight of 43? omitted?158 Da, surrounded by a 5'-untranslated region of 61 nucleotides and a 3'-untranslated region of 277 nucleotides was identified. The protein showed 91% similarity with the translation product of the rat beta-ureidopropionase cDNA. Expression of the human cDNA in an Escherichia coli and eukaryotic COS-7 expression system revealed a very high beta-ureidopropionase enzymatic activity, thus confirming the identity of the cDNA. Since human EST libraries from brain, liver, kidney and heart contained partial beta-ureidopropionase cDNAs, the enzyme seems to be expressed in these tissues, in agreement with the expression profile of this enzyme in rat. Using the human cDNA as a probe a genomic P1 clone could be isolated containing the complete human beta-ureidopropionase gene. The gene consist of 11 exons spanning approximately 20 kB of genomic DNA. Fluorescence in situ hydridization localized the human beta-ureidopropionase gene to 22q11.2. |
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