Genome mining of marine bacteria to uncover and interrogate secondary metabolite biosynthetic pathways

海洋细菌的基因组挖掘揭示和探究次生代谢物生物合成途径

• 批准号: RGPIN-2015-06078
• 负责人: Ross, Avena
• 金额: $ 2.33万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=613927
• 关键词: Genome; mining; marine; bacteria; uncover

I will develop an interdisciplinary research program to identify bioactive compounds from marine bacterial sources and understand the fundamental mechanisms by which they are biosynthesized. This program will provide HQP with the opportunity to engage in several fields including molecular biology, biochemistry, and organic chemistry. By learning about the mechanisms that bacteria use to synthesise complex molecules, scientists can apply the same approaches to engineer bacteria to make new and potentially useful molecules. This has far reaching impacts on large-scale manufacture of complex molecules by fermentation that represents a cost effective and environmentally responsible alternative to total chemical synthesis.  The primary focus of this program is a genus of bacteria called Pseudoalteromonas that has shown promise as a source of interesting biomolecules but is under-investigated to date. In the long term this program will expand to encompass other marine proteobacteria that display biosynthetic potential. A genome-to-molecule approach will be used to identify potentially non-canonical biosynthetic pathways that will then be captured and expressed in a host bacterium to allow molecule discovery and investigation of the biosynthetic enzymes. Initially we will focus on the identification of potentially interesting pathways by analysis of bacterial genome sequences using a process called “Genome Mining”. A groundbreaking technology called Transformation-Associated Recombination will be used to capture pathways of interest. This highly innovative technique enables specific and selective capture of target regions of DNA facilitating subsequent expression and genetic manipulation experiments. This approach has very recently been applied to the capture and study of natural product biosynthetic genes by a very small number of laboratories worldwide, including that of my postdoctoral supervisor, Dr. Moore at UCSD. The use of this technique will be critical to the program, and also completely novel in the Canadian scientific community. After this technique is employed to capture the pathways, they will be heterologously expressed in a host bacterium and product molecules will be identified. Using genetic and enzymology approaches, the biosynthetic genes and corresponding enzymes will then be probed. This technique will allow us to uncover novel biosynthetic processes, prepare novel molecules and better understand the remarkable workings of biosynthetic enzymes.  HQP trained within this program will develop strong communication and leadership skills to complement critical thinking and subject expertise. Through research collaborations, research exchanges and conference attendance, HQP will develop global networks that will maximise their capacity to contribute to the Canadian scientific community, both in academia and industry.

我将开发一个跨学科的研究计划，从海洋细菌来源中识别生物活性化合物，并了解它们被生物合成的基本机制。该项目将为HQP提供从事包括分子生物学、生物化学和有机化学在内的多个领域的机会。 通过了解细菌用来合成复杂分子的机制，科学家们可以应用同样的方法来改造细菌，制造出新的、潜在有用的分子。这对通过发酵大规模制造复杂分子产生了深远的影响，发酵是一种成本效益高、对环境负责的替代全化学合成的方法。 这个计划的主要焦点是一种名为假交替单胞菌的细菌属，它已经显示出作为有趣生物分子来源的希望，但到目前为止还没有得到充分的研究。从长远来看，该计划将扩大到包括其他显示生物合成潜力的海洋蛋白细菌。将使用基因组到分子的方法来识别潜在的非规范生物合成途径，然后这些途径将被捕获并在宿主细菌中表达，以允许分子发现和研究生物合成酶。 最初，我们将专注于通过使用一种名为“基因组挖掘”的过程分析细菌基因组序列来识别潜在的感兴趣的途径。一种名为“转化相关重组”的开创性技术将用于捕获感兴趣的途径。这种高度创新的技术使得能够特定和选择性地捕获DNA的目标区域，从而便于后续的表达和遗传操作实验。这种方法最近被世界各地的极少数实验室用于捕获和研究天然产物生物合成基因，包括我在加州大学圣迭戈分校的博士后导师摩尔博士。这项技术的使用将对该计划至关重要，在加拿大科学界也是完全新颖的。 在利用这项技术捕获这些途径后，它们将在宿主细菌中异源表达，并将鉴定产物分子。使用遗传学和酶学方法，然后将探索生物合成基因和相应的酶。这项技术将使我们能够发现新的生物合成过程，制备新的分子，并更好地了解生物合成酶的非凡工作原理。 在该项目中培训的HQP将发展强大的沟通和领导能力，以补充批判性思维和学科专业知识。通过研究合作、研究交流和出席会议，HQP将发展全球网络，最大限度地提高他们在学术界和工业界为加拿大科学界做出贡献的能力。