Exploring the endophytic parvome for the discovery of novel biologically active molecular scaffolds

探索内生细小组以发现新型生物活性分子支架

• 批准号: RGPIN-2019-04114
• 负责人: Gray, Christopher
• 金额: $ 2.11万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=683093
• 关键词: Exploring; endophytic; parvome; discovery; novel

The growing emergence of microbial strains that are resistant to currently used antibiotic agents is a major threat to human health as resistance to all of the major classes of antibiotics currently in clinical use has already been observed. Pan-resistant pathogens are increasingly being discovered and current forecasts predict that broad-scale ineffectiveness of antimicrobial agents is imminent.******The discovery of novel natural products provides unparalleled access to unprecedented molecular scaffolds and unique molecular structures with desirable bioactivities and potencies that are unavailable through rational and combinatorial synthetic strategies. My research program focuses on the isolation of biologically active natural products that exhibit activity against pathogenic microbes, and consequently have significant potential as lead compounds for the development of new therapeutics for infectious disease. We focus on natural products produced by endophytic fungi of terrestrial, marine and freshwater plants, and a library of about 500 fungal endophyte cultures, many of which could represent new fungal species, is currently under investigation. Additional endophytic strains are continuously being isolated to increase our collection and we will also ferment fungi in co-culture with other fungi and bacteria and under various biological and chemical conditions to trigger cryptic biosynthetic genes and maximise the chemical diversity of our collection.******My group has developed simple, robust and effective bioactivity and metabolomic profiling procedures that we will be applying in our search for novel molecular scaffolds. Fungal extracts will be evaluated in a suite of bioassays to assess their inhibitory effects against pathogenic microorganisms and their ability to modulate efflux pumps within these pathogens. This will allow us to compile bioactivity profiles for the extracts that can be related to the modes-of-action of their antibiotic constituents in an effort to discover new antibiotic classes and also identify natural products that can be used to increase the effectiveness of our current antibiotics by remediating for the effects of drug resistance. In conjunction with the compilation of the bioactivity profiles, NMR and LC-MS based metabolomics approaches will be used to dereplicate extracts that contain known antibiotics and prioritise projects for further investigation. Extracts that exhibit promising bioactivity profiles and unique metabolomic signatures will be subjected to bioassay-guided fractionation to isolate and identify the active components. The modes-of-action of the novel natural products that are isolated will then be probed by genomics, proteomics and chemical genetics. My research will ultimately lead to the discovery of lead compounds from the extensive biodiversity provided by fungal endophytes for the development of new therapeutics to fight infectious disease.**

对目前使用的抗生素产生抗药性的微生物菌株越来越多，这是对人类健康的重大威胁，因为已经观察到对目前临床使用的所有主要类别的抗生素都有抗药性。越来越多的泛耐药病原体被发现，目前的预测是，抗菌剂的大规模无效迫在眉睫。新天然产物的发现提供了前所未有的获得前所未有的分子支架和独特的分子结构，具有理想的生物活性和潜力，这是通过合理和组合合成策略无法获得的。我的研究计划专注于分离具有生物活性的天然产物，这些天然产物具有抗病原微生物的活性，因此具有作为先导化合物的巨大潜力，用于开发新的传染病疗法。我们专注于陆地、海洋和淡水植物内生真菌产生的天然产物，目前正在调查一个约500个真菌内生真菌培养物的文库，其中许多可能代表新的真菌物种。我们正在不断分离更多的内生菌株，以增加我们的收藏，我们还将在与其他真菌和细菌共培养的情况下，在各种生物和化学条件下发酵真菌，以触发隐藏的生物合成基因，并最大限度地增加我们收藏的化学多样性。*我的团队已经开发出简单、强大和有效的生物活性和代谢组谱程序，我们将应用于我们寻找新的分子支架。真菌提取物将在一套生物检测中进行评估，以评估它们对病原微生物的抑制作用，以及它们调节这些病原体内外排泵的能力。这将使我们能够汇编与其抗生素成分的作用模式有关的提取物的生物活性概况，以努力发现新的抗生素类别，并确定可用于通过补救耐药性影响来提高我们现有抗生素有效性的天然产品。结合生物活性图谱的汇编，将使用基于核磁共振和LC-MS的代谢组学方法来分离含有已知抗生素的提取物，并确定进一步研究的优先项目。表现出良好的生物活性特征和独特的代谢组学特征的提取物将接受生物测定指导的分级，以分离和鉴定活性成分。然后，将通过基因组学、蛋白质组学和化学遗传学来探索分离出的新天然产物的作用模式。我的研究最终将从真菌内生真菌提供的广泛生物多样性中发现先导化合物，用于开发抗击传染病的新疗法。**