Abstract
A gene encoding a putative GABA aminotransferase (ugatA) was isolated from the basidiomyceteUstilago maydis via heterologous hybridization to the GABA aminotransferase gene (gatA) ofAspergillus nidulans. The derived amino-acid sequence ofugatA shows strong identity throughout the protein to the GABA aminotransferase enzymes fromA. nidulans andSaccharomyces cerevisiae. Northern analysis inU. maydis indicated that theugatA transcript is inducible by the ω-amino acids GABA and β-alanine, and is not subject to nitrogen catabolite repression. With the use ofugatA promoter-lacZ fusion constructs, it was demonstrated that the removal of sequences located approximately 250 by 5′ to the translational start site ofugatA (including multiple copies of a 7-bp direct repeat) resulted in the loss of induction by ω-amino acids. While theugatA gene under the control of theA. nidulans gatA promoter was able to fully complement agatA − phenotype inA. nidulans, the full-lengthugatA gene was not, suggesting a lack of expression from theU. maydis promoter inA. nidulans. AU. maydis strain with a gene disruption at theugatA locus showed decreased growth on β-alanine as a sole nitrogen source, but was able to grow on GABA as a sole nitrogen source, indicating an alternative pathway for the utilization of GABA inU. maydis.
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Straffon, M.J., Hynes, M.J. & Davis, M.A. Characterization of theugatA gene ofUstilago maydis, isolated by homology to thegatA gene ofAspergillus nidulans . Curr Genet 29, 360–369 (1996). https://doi.org/10.1007/BF02208617
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DOI: https://doi.org/10.1007/BF02208617