Elucidation of Pyranonigrin Biosynthetic Pathway Reveals a Mode of Tetramic Acid, Fused 纬-Pyrone, and exo-Methylene Formation

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• 作者：Tsuyoshi Yamamoto ; Yuta Tsunematsu ; Hiroshi Noguchi ; Kinya Hotta ; Kenji Watanabe
• 刊名：Organic Letters
• 出版年：2015
• 出版时间：October 16, 2015
• 年：2015
• 卷：17
• 期：20
• 页码：4992-4995
• 全文大小：347K
• ISSN：1523-7052

文摘

Successful activation of the pyranonigrin biosynthetic gene cluster and gene knockout in Aspergillus niger plus in vivo and in vitro assays led to isolation of six new products, including a spiro cyclobutane-containing dimeric compound, which served as the basis for the proposed comprehensive pyranonigrin biosynthetic pathway. Two redox enzymes are key to forming the characteristic fused 纬-pyrone core, and a protease homologue performs the exo-methylene formation.