作者:Kwang Hoon Sung、Gesche Berkhan、Tim Hollmann、Lisa Wagner、Wulf Blankenfeldt、Frank Hahn
DOI:10.1002/anie.201707774
日期:2018.1.2
significantly to their biological activity. Here, we report structural and mechanistic investigations on AmbDH3, a polyketide synthase domain with dual activity as dehydratase (DH) and pyran‐forming cyclase in ambruticin biosynthesis. AmbDH3 is similar to monofunctional DH domains, using H51 and D215 for dehydration. V173 was confirmed as a diagnostic residue for cyclization activity by a mutational study and
含氧杂环是聚酮化合物天然产物中常见的结构基序,对它们的生物活性有重要贡献。在这里,我们报告了AmbDH3的结构和机理研究,AmbDH3是一种在琥珀酸生物素合成中具有脱水酶(DH)和吡喃形成环化酶双重活性的聚酮化合物合酶结构域。AmbDH3类似于单功能DH域,使用H51和D215进行脱水。通过突变研究和酶促体外实验,证实V173为环化活性的诊断残基。在看似单功能的AmbDH2中观察到类似的基序,该基序也显示出意想不到的环化酶活性。我们的结果为生物合成途径中隐藏的环化酶的挖掘铺平了道路。