Construction of a genomic library of the food spoilage yeastZygosaccharomyces bailiiand isolation of the β-isopropylmalate dehydrogenase gene (ZbLEU2)

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Abstract
A genomic library of the yeast Zygosaccharomyces bailii ISA 1307 was constructed in pRS316, a shuttle vector for Saccharomyces cerevisiae and Escherichia coli. The library has an average insert size of 6 kb and covers the genome more than 20 times assuming a genome size similar to that of S. cerevisiae. This new tool has been successfully used, by us and others, to isolate Z. bailii genes. One example is the β-isopropylmalate dehydrogenase gene (ZbLEU2) of Z. bailii, which was cloned by complementation of a leu2 mutation in S. cerevisiae. An open reading frame encoding a protein with a molecular mass of 38. 7 kDa was found. The nucleotide sequence of ZbLEU2 and the deduced amino acid sequence showed a significant degree of identity to those of β-isopropylmalate dehydrogenases from several other yeast species. The sequence of ZbLEU2 has been deposited in the EMBL data library under accession number AJ292544.