alexa Isolation and characterization of the urease gene (URE) from the pathogenic fungus Coccidioides immitis.


Journal of Clinical & Cellular Immunology

Author(s): Yu JJ, Smithson SL, Thomas PW, Kirkland TN, Cole GT

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Abstract The urease (URE)-encoding gene from Coccidioides immitis (Ci), a respiratory fungal pathogen of humans, was cloned, sequenced, chromosome-mapped and expressed. Both the genomic and cDNA sequences are reported. The transcription start point and poly(A)-addition site were confirmed. The URE gene contains eight introns and a 2517-bp ORF that translates a 839-amino-acid (aa) protein of 91.5 kDa and pI of 5.5, as deduced by computer analysis of the nucleotide sequence. The translated protein revealed eight putative N-glycosylation sites. The deduced URE showed comparable levels of homology to reported URE of the jack bean plant (Canavalia ensiformis; 71.8\%) and URE of several genera of bacteria (Bp, 71.7\%; Hp, 68.3\%; Ka, 71.6\%; Pm, 71.9\%). The URE gene was mapped to chromosome III of Ci and was shown to be a single copy gene by Southern hybridization. Expression of a 1687-bp fragment of the URE gene in E. coli resulted in the production of a 63-kDa recombinant protein that was recognized in an immunoblot by antiserum raised against the Ka URE homolog. This is the first report of a fungal URE gene.
This article was published in Gene and referenced in Journal of Clinical & Cellular Immunology

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