Microbial Metabolic Cooperation

合养细菌是一组鲜为人知的微生物，在无氧环境(厌氧环境)中，它们在所有自然产生的有机物质的循环中发挥着关键作用。共生是指参与的细菌之间的互惠代谢相互作用。这些细菌作为小型微生物团队的成员工作，这些微生物团队消耗腐烂的动植物材料，并将其转化为植物和藻类光合作用所需的起始材料。合养细菌首先分解和循环利用脂肪、氨基酸和小芳香化合物等小有机分子，并产生醋酸(醋)、水和氢气。然后，第二类被称为产甲烷菌的微生物利用这些合养废物来制造更多的水以及二氧化碳和甲烷。后者可以作为一种可再生能源进行收获。通过合作，这两种微生物都能够获得能量，并在两种微生物都无法单独生长的地方生长。该项目将使用分子和生物化学方法相结合的方法来研究每种微生物的独特代谢技能，以及它们如何相互合作，以最佳地回收自然界中的废物。这些知识将有助于其他人更好地描述和模拟地球上碳的使用，并预测我们不断变化的环境如何影响地球生命形式(生物圈)的维持。这些知识还将提高我们回收环境中不需要的废物的能力。所获得的知识将被用于开发新的基于网络和基于团队的活动，这些活动将促进低水平和高水平的微生物学本科生对微生物学的热情，包括那些来自少数族裔招生机构的本科生。共养代谢是一种微生物过程，几乎在所有厌氧生态系统中都能找到，但对这一重要生态过程的分子、生化或生理基础了解很少。了解由不同类型的细菌和古生菌物种组成的同养联合体如何在代谢和分子水平上运作，对于描述和模拟全球碳循环和生态系统功能至关重要。将被检验的假说表明，共同营养伙伴使用特殊的新陈代谢和感觉/调节系统来实现他们的合作存在。模式合养共培养，合养单胞菌沃尔菲和甲烷螺杆菌，将被用来揭示合养伙伴关系形成和维持的基本原理。包括全基因组转录本和蛋白质组谱在内的高通量技术的组合将被用来识别参与合成脂肪酸分解代谢的代谢和调节网络，并描述维持合成脂肪酸生活方式可能需要的其他适应。这将揭示在电子流动和从热力学上困难的反应中产生氢气和甲酸盐的途径，以及合养合作所需的特殊生化机械和调控控制。这些数据将为预测和探索其他多物种微生物群落的相关过程提供基础。

Syntrophic bacteria are a group of poorly understood microorganisms that play essential roles in the recycling of all naturally occurring organic materials in environments without oxygen (anaerobic environments). Syntrophy refers to the mutually beneficial metabolic interactions of the participating bacteria. These bacteria work as members of small microbial teams that consume decaying plant and animal material and convert it back into the starting materials needed for photosynthesis by plants and algae. The syntrophic bacteria first break down and recycle small organic molecules such as fats, amino acids and small aromatic compounds and make acetic acid (vinegar), water and hydrogen gas. These syntrophic waste products are then used by a second group of microbes called methanogens to make more water plus carbon dioxide and methane. The latter can be harvested as a renewable energy source. By cooperating, both types of microbes are able to obtain energy and grow where neither could alone. This project will use a combination of molecular and biochemical methods to study the unique metabolic skills of each microbe and how they cooperate with one another to optimally recycle waste materials in nature. This knowledge will assist others to better describe and model the use of carbon on Earth and to predict how our ever-changing environment affects the maintenance of the Earth's life forms (the biosphere). This knowledge will also improve our ability to recycle unwanted waste materials in the environment. The knowledge obtained will be used develop new web-based and team-based activities that will promote enthusiasm for microbiology to lower and upper level microbiology undergraduates, including those from institutions with a large minority enrollment.Syntrophic metabolism is a microbial process found in nearly all anaerobic ecosystems yet very little is understood about the molecular, biochemical, or physiological basis of this essential ecological process. Understanding how syntrophic consortia composed of distinct types of bacterial and archaeal species operate at the metabolic and molecular levels is critical to describe and model global carbon cycling and ecosystem function. The hypothesis to be tested states that special metabolic and sensory/regulatory systems are used by syntrophic partners to accomplish their cooperative existence. The model syntrophic co-culture, Syntrophomonas wolfei and Methanospirillum hungatei, will be used to unravel the basic principles governing syntrophic partnership formation and maintenance. A combination of high-throughput technologies including genome-wide transcript and proteomic profiling will be used to identify the metabolic and regulatory networks involved in syntrophic fatty acid catabolism and to delineate other adaptations that may be required to maintain the syntrophic lifestyle. This will reveal the pathways operative in electron flow and hydrogen and/formate production from thermodynamically difficult reactions as well as special biochemical machinery and regulatory controls needed for syntrophic cooperation. These data will provide a foundation to predict and explore related processes in other multispecies microbial communities.