Creating a niche for engineered live biotherapeutics

项目摘要 该提案的长期目标是改善小分子递送的结果， 肽和蛋白质到人类肠道的工程活双歧杆菌。到 为了实现这一目标，我们将使用两种策略来优化肠道中的生物量生长 环境首先，我们将匹配益生元化合物（复杂的碳水化合物不消化， 身体）与异源表达的酶，允许细胞利用这些特权 碳源。第二，我们将在我们的候选生物治疗药物中创建基因组规模的文库， E.大肠杆菌Nissle 1917和乳酸乳球菌，以确定基因产物，增加健身在 肠道和类似肠道的环境。这些方法将在体外培养、小肠 类器官共培养，并在小鼠肠道中体内测定生物素的富集 群体的治疗性小分子、肽或蛋白质的增强的产生。 兴趣和表型结果的系统越来越逼真的人类肠道。

PROJECT SUMMARY The long-term goal of this proposal is to improve outcomes of delivery of small molecules, peptides, and proteins to the human gut by engineered live biotherapeutic bacteria. To accomplish this, we will use two strategies to optimize biotherapeutic growth in the gut environment. First, we will match prebiotic compounds (complex carbohydrates not digested by the body) with heterologous expression of enzymes that allow cells to utilize these privileged carbon sources. Second, we will create genome-scale libraries in our candidate biotherapeutics, E. coli Nissle 1917 and Lactococcus lactis, to identify gene products that increase fitness in the gut and gut-like environments. The methods will be tested in in vitro culture, small intestinal organoid co-culture, and in vivo in the mouse gut to determine enrichment of the biotherapeutic population, enhanced production of the therapeutic small molecule, peptide, or protein of interest, and phenotypic outcome in systems of increasing verisimilitude to the human gut.