التفاصيل البيبلوغرافية
| العنوان: |
Regulation of metabolism and proton motive force generation during mixed carbon fermentation by an Escherichia coli strain lacking the FOF1-ATPase. |
| المؤلفون: |
Gevorgyan, Heghine1,2,3 (AUTHOR), Baghdasaryan, Lilit1,3 (AUTHOR), Trchounian, Karen1,2,3 (AUTHOR) k.trchounian@ysu.am |
| المصدر: |
BBA - Bioenergetics. Apr2024, Vol. 1865 Issue 2, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*METABOLIC regulation, *ESCHERICHIA coli, *PROTONS, *FERMENTATION, *BACTERIAL growth, *OXYGEN carriers, *FOOD fermentation, *ETHANOL, *LACTIC acid |
| مستخلص: |
Proton F O F 1 -ATPase is the key enzyme in E. coli under fermentative conditions. In this study the role of E. coli proton ATPase in the μ and formation of metabolic pathways during the fermentation of mixture of glucose, glycerol and formate using the DK8 (lacking F O F 1) mutant strain was investigated. It was shown that the contribution of F O F 1 -ATPase in the specific growth rate was ∼45 %. Formate was not taken up in the DK8 strain during the initial hours of the growth. The utilization rates of glucose and glycerol were unchanged in DK8, however, the production of succinate, lactate and ethanol was decreased causing a reduction of the redox state up to −450 mV. Moreover, the contribution of F O F 1 -ATPase in the interplay between H+ and H 2 cycles was described depending on the bacterial growth phase and main utilizing substrate. Besides, the H 2 production rate in the DK8 strain was decreased by ∼60 % at 20 h and was absent at 72 h. Δp was decreased from −157 ± 4.8 mV to −140 ± 4.2 mV at 20 h and from −195 ± 5.9 mV to −148 ± 4.4 mV at 72 h, compared to WT. Taken together it can be concluded that during fermentation of mixed carbon sources metabolic cross talk between F O F 1 -ATPase-TrkA-Hyd-Fdh-H is taking place for maintaining the cell energy balance via regulation proton motive force. [Display omitted] • Formate was not taken up in the E. coli strain lacking the FoF 1 during the first hour of growth. • H 2 production in FoF 1 mutant was decreased by ∼60 % at 20 h and absent at 72 h. • Proton motive force was decreased by ∼17 mV (20 h) and ∼47 mV (72 h) compared to WT. • Hyd activity was preserved by ∼50 % in FoF 1 mutant when glycerol was fermented. • FoF 1 mutant strain does not have Hyd activity during glucose fermentation. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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