title: Metabolic flux and robustness analysis of glycerol metabolism in Klebsiella pneumoniae.
abstract: The knowledge of the mechanism of flux distribution will benefit understanding cell physiology and regulation of metabolism. In this study, the measured fluxes obtained under steady-state conditions were used to estimate intracellular fluxes and identify the robustness of branch points of the anaerobic glycerol metabolism in Klebsiella pneumoniae for the production of 1,3-propanediol by metabolic flux analysis. The biomass concentration increased as NADH(2)/NAD(+) decreased at low initial concentration and inversed at high initial glycerol concentration. The flux distribution revealed that the branch points of glycerol and dihydroxyacetonephosphate were rigid to the environmental conditions. However, the pyruvate and acetyl coenzyme A metabolisms gave cells the flexibility to regulate the energy and intermediate fluxes under various environmental conditions. Additionly, it was found that the formation rate of ethanol and the ratio of pyruvate dehydrogenase to pyruvate formate lyase appeared visible fluctuations at high glycerol uptake rate.
authors: Department of Bioscience and Biotechnology, Dalian University of Technology, Linggong Road 2, Dalian, 116023, People's Republic of China.
authors: Qingrui
authors: Q
authors: Zhang
authors: Hu
authors: H
authors: Teng
authors: Yaqin
authors: Y
authors: Sun
authors: Zhilong
authors: Z
authors: Xiu
authors: Anping
authors: A
authors: Zeng
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods; D003198:Computer Simulation; D004734:Energy Metabolism / Q000502:physiology*; D005990:Glycerol / Q000378:metabolism*; D007711:Klebsiella pneumoniae / Q000378:metabolism*; D008657:Metabolic Clearance Rate; D008954:Models, Biological; D011409:Propylene Glycols / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D011409:Propylene Glycols; C041787:1,3-propanediol; D005990:Glycerol