NOVEL TACROLIMUS ANALOGUES, A NEUROPROTECTIVE COMPOSITION COMPRISING THE SAME, AN IMMUNOSUPPRESSIVE COMPOSITION COMPRISING THE SAME, A METHOD FOR PREPARING THE SAME, AND A MUTANT FOR PRODUCING THE SAME
Characterization of the promiscuous <i>N</i>-acyl CoA transferase, LgoC, in legonoxamine biosynthesis
作者:Fleurdeliz Maglangit、Saad Alrashdi、Justine Renault、Laurent Trembleau、Catherine Victoria、Ming Him Tong、Shan Wang、Kwaku Kyeremeh、Hai Deng
DOI:10.1039/d0ob00320d
日期:——
More than 500 siderophores are known to date, but only three were identified to be aryl-containing hydroxamate siderophores, legonoxamines A and B from Streptomyces sp. MA37, and aryl ferrioxamine 2 from Micrococcus luteus KLE1011.
A mechanism-based fluorescence transfer assay for examining ketosynthase selectivity
作者:Gitanjeli Prasad、Lawrence S. Borketey、Tsung-Yi Lin、Nathan A. Schnarr
DOI:10.1039/c2ob26008e
日期:——
Since their discovery, polyketide synthases have received massive attention from researchers hoping to harness their potential as a platform for generating new and improved therapeutics. Despite significant strides toward this end, inherent specificities within the enzymes responsible for polyketide production have severely limited these efforts. We have developed a mechanism-based, fluorescence transfer assay for a key enzyme component of all polyketide synthases, the ketosynthase domain. As demonstrated, this method can be used with both ketosynthase-containing didomains and full modules. As proof of principle, the ketosynthase domain from module 6 of the 6-deoxyerythronolide synthase is examined for its ability to accept a variety of simple thioester substrates. Consistent with its natural hexaketide substrate, we find that this ketosynthase prefers longer, α-branched thioesters and its ability to distinguish these structural features is quite remarkable. Substrate electronics are also tested via a variety of p-substituted aromatic groups. In all, we expect this technique to find considerable use in the field of polyketide biosynthesis and engineering due to its extraordinary simplicity and very distinct visible readout.
of congeners. This first structural analysis of loading ATs from modular PKSs revealed the molecular basis for the relaxed substrate specificity. Residues important for substratebinding and discrimination were predicted by modeling a substrate into the active site. A mutant with altered specificity toward a panel of synthetic substrate mimics was generated by site-directed mutagenesis of the active
Biosynthesis of the Allylmalonyl-CoA Extender Unit for the FK506 Polyketide Synthase Proceeds through a Dedicated Polyketide Synthase and Facilitates the Mutasynthesis of Analogues
作者:SangJoon Mo、Dong Hwan Kim、Jong Hyun Lee、Je Won Park、Devi B. Basnet、Yeon Hee Ban、Young Ji Yoo、Shu-wei Chen、Sung Ryeol Park、Eun Ae Choi、Eunji Kim、Ying-Yu Jin、Sung-Kwon Lee、Ju Yeol Park、Yuan Liu、Mi Ok Lee、Keum Soon Lee、Sang Jun Kim、Dooil Kim、Byoung Chul Park、Sang-gi Lee、Ho Jeong Kwon、Joo-Won Suh、Bradley S. Moore、Si-Kyu Lim、Yeo Joon Yoon
DOI:10.1021/ja108399b
日期:2011.2.2
engineered biosynthesis of novel allyl group-modified FK506 analogues, 36-fluoro-FK520 and 36-methyl-FK506, the latter of which exhibits improved neurite outgrowth activity. This unique feature of FK506 biosynthesis, in which a dedicated PKS provides an atypicalextenderunit for the main modular PKS, illuminates a new strategy for the combinatorial biosynthesis of designer macrolide scaffolds as well
免疫抑制剂 FK506 的烯丙基部分在聚酮化合物中结构独特,对其有效的生物活性至关重要。在这里,我们基于对三个 FK506 基因簇的全面化学、生物化学和遗传询问,详细介绍了烯丙基丙二酰辅酶 A (CoA) 的生物合成途径,FK506 烯丙基是由 CoA 衍生而来。具有非规范结构域结构的离散聚酮合酶 (PKS) 可能与宿主的脂肪酸合酶途径协调,通过反式 2-戊烯酰基载体蛋白催化烯丙基丙二酰辅酶 A 的多步酶促反应。这一离散途径的表征促进了新型烯丙基修饰的 FK506 类似物、36-氟-FK520 和 36-甲基-FK506 的工程生物合成,后者表现出改善的神经突生长活性。 FK506 生物合成的这一独特特征(其中专用 PKS 为主模块化 PKS 提供非典型延伸单元)阐明了设计大环内酯支架和 FK506 类似物的组合生物合成的新策略。