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首页> 外文期刊>Biochemical Genetics >A Single Amino Acid Substitution in One of the Lipases of Aspergillus nidulans Confers Resistance to the Antimycotic Drug Undecanoic Acid
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A Single Amino Acid Substitution in One of the Lipases of Aspergillus nidulans Confers Resistance to the Antimycotic Drug Undecanoic Acid

机译:在构巢曲霉的脂肪酶之一中的单个氨基酸取代赋予抗真菌药十一烷酸的抗性

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摘要

A plausible approach to evaluate the inhibitory action of antifungals is through the investigation of the fungal resistance to these drugs. We describe here the molecular cloning and initial characterization of the A. nidulans lipA gene, where mutation (lipA1) conferred resistance to undecanoic acid, the most fungitoxic fatty acid in the C7:0–C18:0 series. The lipA gene codes for a putative lipase with the sequence consensus GVSIS and WIFGGG as the catalytic signature. Comparison of the wild-type and LIP1 mutant strain nucleotide sequences showed a G → A change in lipA1 allele, which results in a Glu214 → Lys substitution in LipA protein. This ionic charge change in a conserved LipA region, next to its catalytic site, may have altered the catalytic properties of this enzyme resulting in resistance to undecanoic acid.
机译:评估抗真菌药物抑制作用的一种可行方法是通过对这些药物的真菌抗性进行研究。我们在这里描述构巢曲霉lipA基因的分子克隆和初步表征,其中突变(lipA1)赋予了对十一烷酸(C 7:0 –C > 18:0 系列。 lipA基因编码一个假定的脂肪酶,其序列共有GVSIS和WIFGGG作为催化特征。通过对野生型和LIP1突变菌株核苷酸序列的比较,发现lipA1等位基因发生了G→A变化,导致LipA蛋白被Glu 214 →Lys取代。保守的LipA区域中靠近其催化位点的离子电荷变化可能已经改变了该酶的催化特性,从而导致了对十一酸的抗性。

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