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    J Biol Chem. 1992 Jan 15;267(2):871-5.

    Cloning human pyrroline-5-carboxylate reductase cDNA by complementation in Saccharomyces cerevisiae.

    Dougherty KM, Brandriss MC, Valle D.

    Laboratory of Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.

    Pyrroline-5-carboxylate reductase (EC 1.5.1.2) catalyzes the NAD(P)H-dependent conversion of pyrroline-5-carboxylate to proline. We cloned a human pyrroline-5-carboxylate reductase cDNA by complementation of proline auxotrophy in a Saccharomyces cerevisiae mutant strain, DT1100. Using a HepG2 cDNA library in a yeast expression vector, we screened 10(5) transformants, two of which gained proline prototrophy. The plasmids in both contained similar 1.8-kilobase inserts, which when reintroduced into strain DT1100, conferred proline prototrophy. The pyrroline-5-carboxylate reductase activity in these prototrophs was 1-3% that of wild type yeast, in contrast to the activity in strain DT1100 which was undetectable. The 1810-base pair pyrroline-5-carboxylate reductase cDNA hybridizes to a 1.85-kilobase mRNA in samples from human cell lines and predicts a 319-amino acid, 33.4-kDa protein. The derived amino acid sequence is 32% identical with that of S. cerevisiae. By genomic DNA hybridization analysis, the human reductase appears to be encoded by a single copy gene which maps to chromosome 17.

    PMID: 1730675 [PubMed - indexed for MEDLINE]

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