Unveiling Two Consecutive Hydroxylations: Mechanisms of Aromatic Hydroxylations Catalyzed by Flavin‐Dependent Monooxygenases for the Biosynthesis of Actinorhodin and Related Antibiotics
作者:Makoto Hashimoto、Takaaki Taguchi、Kazuki Ishikawa、Ryuichiro Mori、Akari Hotta、Susumu Watari、Kazuaki Katakawa、Takuya Kumamoto、Susumu Okamoto、Koji Ichinose
DOI:10.1002/cbic.201900490
日期:2020.3.2
Flavin-dependent monooxygenases are ubiquitous in living systems and are classified into single- or two-component systems. Actinorhodin, produced by Streptomyces coelicolor, is a representative polycyclic polyketide that is hydroxylated through the action of the two-component ActVA-5/ActVB hydroxylase system. These homologous systems are widely distributed in bacteria, but their reaction mechanisms
黄素依赖性单加氧酶在生活系统中普遍存在,并分为单组分或两组分系统。由天蓝色链霉菌(Streptomyces coelicolor)产生的放线菌丝蛋白是一种代表性的多环聚酮化合物,其通过两组分ActVA-5 / ActVB羟化酶系统的作用而被羟基化。这些同源系统广泛分布在细菌中,但它们的反应机理仍不清楚。这项体外研究提供了通过参与放线菌ho素生物合成的羟基萘中间体两次连续羟基化的化学证据。ActVA-5加氧酶组分催化底物的逐步二羟基化,而ActVB黄素还原酶不仅提供了还原的辅因子,还调节了中间体的醌-氢醌互变。