恶臭假单胞菌KT2440的计算机模拟估计生物量产量的实验验证

Experimental validation of in silico estimated biomass yields of Pseudomonas putida KT2440.

作者信息

Hintermayer Sarah Beate, Weuster-Botz Dirk

机构信息

Institute of Biochemical Engineering, Technische Universität München, Garching, Germany.

出版信息

Biotechnol J. 2017 Jun;12(6). doi: 10.1002/biot.201600720. Epub 2017 Apr 28.

Abstract

Pseudomonas putida is rapidly becoming a microbial cell platform for biotechnological applications. In order to understand genotype-phenotype relationships genome scale models represent helpful tools. However, the validation of in silico predictions of genome scale models is a task that is rarely performed. In this study the theoretical biomass yields of Pseudomonas putida KT2440 were estimated for 57 different carbon sources based on a genome scale stoichiometric model applying flux balance analysis. The batch growth of P. putida KT2440 with six individual carbon sources covering the range of maximal to minimal in silico biomass yields (acetate, glycerol, citrate, succinate, malate and methanol, respectively) was studied in a defined mineral medium in a fully controlled stirred-tank bioreactor on a 3 L scale. The highest growth rate of P. putida KT2440 was measured with succinate as carbon source (0.51 h ). Among the 57 carbon sources tested, glycerol resulted in the highest estimated biomass yield (0.61 molC molC ) which was experimentally confirmed. The comparison of experimental determined biomass yields with a modified version of the model iJP815 showed deviations of only up to 10%. The experimental data generated in this study can also be used in future studies to further improve the genome scale models of P. putida KT2440. Improved models will then help to gain deeper insights in genotype-phenotype relationships.

摘要

恶臭假单胞菌正迅速成为用于生物技术应用的微生物细胞平台。为了理解基因型 - 表型关系,基因组规模模型是很有用的工具。然而,对基因组规模模型的计算机模拟预测进行验证是一项很少进行的任务。在本研究中,基于应用通量平衡分析的基因组规模化学计量模型,估计了恶臭假单胞菌KT2440在57种不同碳源上的理论生物量产量。在一个3升规模的完全受控搅拌罐生物反应器中,在限定的矿物培养基中研究了恶臭假单胞菌KT2440分别以六种覆盖计算机模拟生物量产量从最大到最小范围的单一碳源(即乙酸盐、甘油、柠檬酸盐、琥珀酸盐、苹果酸盐和甲醇)进行的分批生长。以琥珀酸盐作为碳源时测得恶臭假单胞菌KT2440的最高生长速率(0.51 h⁻¹)。在所测试的57种碳源中,甘油产生了最高的估计生物量产量(0.61 molC/molC),这在实验中得到了证实。将实验测定的生物量产量与模型iJP815的改进版本进行比较,发现偏差仅高达10%。本研究中产生的实验数据也可用于未来的研究,以进一步改进恶臭假单胞菌KT2440的基因组规模模型。改进后的模型将有助于更深入地了解基因型 - 表型关系。

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