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The Tri-functional Histidine Biosynthesis Gene (his) in Wheat Stagonospora Nodorum Blotch Pathogen, Phaeosphaeria nodorum

小麥葉枯病菌(Phaeosphaeria nodorum)的三功能-組氨酸生合成基因

摘要


本研究利用「降溫式(step down)」聚合酶連鎖反應(PCR)技術山小麥葉桔病菌(Phaeosphaeria nodorum)的基因組核酸中取得組氨酸生合成基因(his)序列。此his基因片段長度為2700 bp,包含二個外顯子(exon)及一個51-bp長的內含子(intron),這二個外顯子編碼(encode)了一個含881個氨基酸的完整蛋白質。如同其他絲狀子囊菌的組氨酸合成蛋白,小麥葉枯病菌his,基因的推演(deduced)蛋白質中包含三個具生合成活性的保守性區域(consorved domain) :磷酸核糖基-腺苷單磷酸環化水解酶(phosphoribosyl-AMP cyclohydrolase; PRA-CH; EC 3.5.4.19),磷酸核糖基-腺苷三磷酸焦磷酸水解酶(phosphoribosyl-ATP pyrophosphohydrolase: PRA-PH; EC 3.6.1.3.1),與組氨酸脫氫酶(histidinol dehydrogenase; HDH; EC 1.1.1.23)。文中也將討論此三功能-組氨酸生合成蛋白與其受質和鋅離子的結合位置。

並列摘要


The histidine biosynthesis gene (his) sequence was obtained from wheat-biotype Phaeosphaeria nodorum genomic DNA using a ”step down” PCR amplification technique. The 2700-bp his gene fragment contained two exons and a 51-bp intron. The two exons of this gene encoded a complete 881-amino acid protein. Like the histidine synthesis proteins in other filamentous ascomycetes, the deduced protein contained the conserved domains for three biosynthetic activities: phosphoribosyl-AMP cyclohydrolase (PRA-CH; EC 3.5.4.19), phosphoribosyl-ATP pyrophosphohydrolase (PRA-PH; EC 3.6.1.31), and histidinol dehydrogenase (HDH; EC 1.1.1.23). The substrate and zinc ion binding location in this tri-functional histidine biosynthesis protein is discussed.

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