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. 1994 May;176(9):2640–2647. doi: 10.1128/jb.176.9.2640-2647.1994

Molecular cloning and expression of the Candida albicans beta-N-acetylglucosaminidase (HEX1) gene.

R D Cannon 1, K Niimi 1, H F Jenkinson 1, M G Shepherd 1
PMCID: PMC205403  PMID: 8169213

Abstract

beta-N-Acetylglucosaminidase was purified from the spent culture medium of Candida albicans A72 grown in the presence of N-acetylglucosamine (GlcNAc). The N-terminal amino acid sequence of the protein was determined, two degenerate oligonucleotide probes were constructed, and a 3.9-kb BamHI fragment of DNA that hybridized to both probes was subcloned from a lambda EMBL4 library of C. albicans A72 genomic DNA. This fragment of DNA contained the entire beta-N-acetylglucosaminidase (HEX1) gene, which consisted of an open reading frame coding for a polypeptide precursor of 562 amino acids with a putative 22-amino-acid leader sequence. The deduced HEX1 amino acid sequence showed similarity to hexosaminidases from a variety of organisms. Growth of C. albicans on GlcNAc induced transcription of HEX1, resulting in increased specific beta-N-acetylglucosaminidase activity. HEX1 mRNA (2.35 kb) from GlcNAc-grown cells was approximately 200 bp larger than HEX1 mRNA from cells grown on glucose. This size difference was suggested to result from the use of alternative transcription termination sites. The cloned HEX1 gene introduced into C. albicans SGY-243 on a plasmid also responded to GlcNAc induction.

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