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Thermodynamic Driving Force of Hydrogen on Rumen Microbial Metabolism: A Theoretical Investigation

van Lingen, Henk J ; Plugge, Caroline M ; Fadel, James G ; Kebreab, Ermias ; Bannink, André ; Dijkstra, Jan Senko, John M.

PloS one, 2016-10, Vol.11 (10), p.e0161362-e0161362 [Periódico revisado por pares]

United States: Public Library of Science

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Título:
Thermodynamic Driving Force of Hydrogen on Rumen Microbial Metabolism: A Theoretical Investigation
Autor: van Lingen, Henk J ; Plugge, Caroline M ; Fadel, James G ; Kebreab, Ermias ; Bannink, André ; Dijkstra, Jan
Senko, John M.
Assuntos: Acetic acid ; Animal Nutrition ; Animals ; Archaea ; Biology and Life Sciences ; Cytochromes ; Diervoeding ; Ecology ; Equilibrium conditions ; Esters ; Fatty acids ; Fatty Acids, Volatile - metabolism ; Fermentation ; Ferredoxin ; Ferredoxins - chemistry ; Ferredoxins - metabolism ; Glucose ; Glucose - metabolism ; Hydrogen ; Hydrogen - metabolism ; Hydrogen ion concentration ; Investigations ; Kinases ; Laboratories ; Laboratorium voor Microbiologie ; Leerstoelgroep Diervoeding ; LR - Animal Nutrition ; LR - Diervoeding ; Metabolism ; Metabolites ; Methane ; Methanogenesis ; Microbiological Laboratory ; Microbiologie ; Microbiology ; Microorganisms ; Models, Theoretical ; NAD ; NAD - chemistry ; NAD - metabolism ; NADH ; Nicotinamide adenine dinucleotide ; Nutrition ; Oxidation ; Partial pressure ; Pathways ; pH effects ; Physical Sciences ; Physiological aspects ; Physiology ; Predictive control ; Propionic acid ; Rumen ; Rumen - microbiology ; Rumen fermentation ; Thermodynamics ; Unity ; Volatile fatty acids ; WIAS ; WIMEK
É parte de: PloS one, 2016-10, Vol.11 (10), p.e0161362-e0161362
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Conceptualization: HJvL JGF.Data curation: HJvL.Formal analysis: HJvL.Funding acquisition: JD.Investigation: HJvL CMP JGF.Methodology: HJvL JGF.Project administration: HJvL.Resources: HJvL CMP JGF.Software: HJvL JGF.Supervision: JGF AB JD.validation: CMP JGF JD.visualization: HJvL JGF AB JD.Writing – original draft: HJvL.Writing – review & editing: CMP JGF EK AB JD.
Competing Interests: The authors have declared that no competing interests exist.
Descrição: Hydrogen is a key product of rumen fermentation and has been suggested to thermodynamically control the production of the various volatile fatty acids (VFA). Previous studies, however, have not accounted for the fact that only thermodynamic near-equilibrium conditions control the magnitude of reaction rate. Furthermore, the role of NAD, which is affected by hydrogen partial pressure (PH2), has often not been considered. The aim of this study was to quantify the control of PH2 on reaction rates of specific fermentation pathways, methanogenesis and NADH oxidation in rumen microbes. The control of PH2 was quantified using the thermodynamic potential factor (FT), which is a dimensionless factor that corrects a predicted kinetic reaction rate for the thermodynamic control exerted. Unity FT was calculated for all glucose fermentation pathways considered, indicating no inhibition of PH2 on the production of a specific type of VFA (e.g., acetate, propionate and butyrate) in the rumen. For NADH oxidation without ferredoxin oxidation, increasing PH2 within the rumen physiological range decreased FT from unity to zero for different NAD+ to NADH ratios and pH of 6.2 and 7.0, which indicates thermodynamic control of PH2. For NADH oxidation with ferredoxin oxidation, increasing PH2 within the rumen physiological range decreased FT from unity at pH of 7.0 only. For the acetate to propionate conversion, FT increased from 0.65 to unity with increasing PH2, which indicates thermodynamic control. For propionate to acetate and butyrate to acetate conversions, FT decreased to zero below the rumen range of PH2, indicating full thermodynamic suppression. For methanogenesis by archaea without cytochromes, FT differed from unity only below the rumen range of PH2, indicating no thermodynamic control. This theoretical investigation shows that thermodynamic control of PH2 on individual VFA produced and associated yield of hydrogen and methane cannot be explained without considering NADH oxidation.
Editor: United States: Public Library of Science
Idioma: Inglês

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Thermodynamic Driving Force of Hydrogen on Rumen Microbial Metabolism: A Theoretical Investigation

van Lingen, Henk J ; Plugge, Caroline M ; Fadel, James G ; Kebreab, Ermias ; Bannink, André ; Dijkstra, Jan Senko, John M.

United States: Public Library of Science

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