The Botrytis cinerea type III polyketide synthase shows unprecedented high catalytic efficiency toward long chain acyl-CoAs
作者:Marimuthu Jeya、Tae-Su Kim、Manish Kumar Tiwari、Jinglin Li、Huimin Zhao、Jung-Kul Lee
DOI:10.1039/c2mb25282a
日期:——
BPKS from Botrytis cinerea is a novel type III polyketide synthase that accepts C4–C18 aliphatic acyl-CoAs and benzoyl-CoA as the starters to form pyrones, resorcylic acids and resorcinols through sequential condensation with malonyl-CoA. The catalytic efficiency (kcat/Km) of BPKS was 2.8 × 105 s−1 M−1 for palmitoyl-CoA, the highest ever reported. Substrate docking analyses addressed the unique features of BPKS such as its high activity and high specificity toward long chain acyl-CoAs.
Lipidic polyketides: We examined the in vitro reactions catalyzed by RpsA, a bacterial typeIIIpolyketidesynthase (PKS) from Rhodospirillum centenum. RpsA is the first typeIII PKS shown to be able to efficiently accept two molecules of extender methylmalonyl‐CoA and to synthesize tetraketide compounds through aldol condensation induced by methine proton abstraction.
Substituted 2-pyrones, 2-pyridones, and other congeners of elasnin as potential agents for the treatment of chronic obstructive lung diseases
作者:William C. Groutas、Michael A. Stanga、Michael J. Brubaker、Tien L. Huang、Min K. Moi、Robert T. Carroll
DOI:10.1021/jm00146a023
日期:1985.8
Several congeners of elasnin (I) have been synthesized and shown to inhibit human leukocyte elastase (HLE). The C-3 alkyl substituted 2-pyrones 11 and 12 were found to be the most effective inhibitors of the enzyme. These compounds are highly specific in their inhibitory activity.
Exploiting the Reaction Flexibility of a Type III Polyketide Synthase through in Vitro Pathway Manipulation
作者:Jae-Cheol Jeong、Aravind Srinivasan、Sabine Grüschow、Horacio Bach、David H. Sherman、Jonathan S. Dordick
DOI:10.1021/ja0441559
日期:2005.1.1
synthesis of the pentaketide flaviolin and its dimeric derivative, and a wide range of pyrones and their coupled derivatives with flaviolin, as well as their halogenated derivatives. The addition of acyl-CoA oxidase to the pathway prior to the polyketide synthase resulted in unsaturated pyrone sidechains, further broadening the product spectrum that can be achieved. The approach developed in this work
在体外构建了一个合成代谢途径,包括来自天蓝色链霉菌的 III 型聚酮化合物合酶和来自大豆和烟熏蓝藻(氯过氧化物酶)的过氧化物酶。这导致合成了五肽黄素及其二聚衍生物,以及广泛的吡喃酮及其与黄素的偶联衍生物,以及它们的卤化衍生物。在聚酮合酶之前将酰基辅酶A氧化酶添加到途径中导致不饱和的吡喃酮侧链,进一步拓宽了可以实现的产物谱。因此,这项工作中开发的方法为在复杂天然产物衍生物的合成中利用生物催化提供了一种新模型。
COUMESTAN-LIKE ANTIOXIDANTS AND UV ABSORBANTS
申请人:Wagner Barbara
公开号:US20100330009A1
公开(公告)日:2010-12-30
The present invention relates to derivatives of the 1H-pyrano[4,3-b]benzofuran-1-one structure and their nitrogen analogues which possess powerful antioxidant properties combined with a highly effective UV absorbing functionality in one molecule. These compounds are especially useful in cosmetical and dermatological formulations.