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J. Bacteriol., 04 1997, 2331-2338, Vol 179, No. 7
Copyright © 1997, American Society for Microbiology

Overexpression of a cloned IMP dehydrogenase gene of Candida albicans confers resistance to the specific inhibitor mycophenolic acid

GA Kohler, TC White and N Agabian
Department of Stomatology, University of California-San Francisco, 94143-0422, USA.

An IMP dehydrogenase gene was isolated from Candida albicans on a approximately 2.9-kb XbaI genomic DNA fragment. The putative Candida IMP dehydrogenase gene (IMH3) encodes a protein of 521 amino acids with extensive sequence similarity to the IMP dehydrogenases of Saccharomyces cerevisiae and various other organisms. Like the S. cerevisiae IMH3 sequence characterized in the genome sequencing project, the open reading frame of the C. albicans IMH3 gene is interrupted by a small intron (248 bp) with typical exon-intron boundaries and a consensus S. cerevisiae branchpoint sequence. IMP dehydrogenase mRNAs are detected in both the yeast and hyphal forms of C. albicans as judged by Northern hybridization. Growth of wild-type (sensitive) C. albicans cells is inhibited at 1 microg of mycophenolic acid (MPA), a specific inhibitor of IMP dehydrogenases, per ml, whereas transformants hosting a plasmid with the IMH3 gene are resistant to MPA levels of up to at least 40 microg/ml. The resistance of cells to MPA is gene dosage dependent and suggests that IMH3 can be used as a dominant selection marker in C. albicans.


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