Genetic characterization of the Neurospora crassa molybdenum cofactor biosynthesis

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• 作者：Corinna Probst^a ; ¹ ; Phillip Ringel^a ; ¹ ; Verena Boysen^b ; Lisette Wirsing^b ; Mariko Matsuda Alexander^a ; ² ; Ralf R. Mendel^a ; ^{r.mendel@tu-bs.de" class="auth_mail} ; Tobias Kruse^a
• 关键词：Neurospora crassa ; nit Mutant ; Molybdenum cofactor ; Molybdenum cofactor biosynthesis
• 刊名：Fungal Genetics and Biology
• 出版年：May, 2014
• 年：2014
• 卷：66
• 期：Complete
• 页码：69-78
• 全文大小：2578 K

文摘

Molybdenum (Mo) is a trace element that is essential for important cellular processes. To gain biological activity, Mo must be complexed in the molybdenum cofactor (Moco), a pterin derivative of low molecular weight. Moco synthesis is a multi-step pathway that involves a variable number of genes in eukaryotes, which are assigned to four steps of eukaryotic Moco biosynthesis. Moco biosynthesis mutants lack any Moco-dependent enzymatic activities, including assimilation of nitrate (plants and fungi), detoxification of sulfite (humans and plants) and utilization of hypoxanthine as sole N-source (fungi). We report the first comprehensive genetic characterization of the Neurospora crassa (N. crassa) Moco biosynthesis pathway, annotating five genes which encode all pathway enzymes, and compare it with the characterized Aspergillus nidulans pathway. Biochemical characterization of the corresponding knock-out mutants confirms our annotation model, documenting the N. crassa/A. nidulans (fungal) Moco biosynthesis as unique, combining the organizational structure of both plant and human Moco biosynthesis genes.