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Gluconeogenesis (GNG) is a metabolic pathway that results in the biosynthesis of glucose from certain non-carbohydrate carbon substrates. It is a ubiquitous process, present in plants, animals, fungi, bacteria, and other microorganisms. [1] In vertebrates, gluconeogenesis occurs mainly in the liver and, to a lesser extent, in the cortex of the ...
Gluconeogenesis (GNG) is a metabolic pathway that results in the generation of glucose from certain non-carbohydrate carbon substrates. It is a ubiquitous process, present in plants, animals, fungi, bacteria, and other microorganisms. [6] In vertebrates, gluconeogenesis occurs mainly in the liver and, to a lesser extent, in the cortex of the ...
In plants the glyoxylate cycle occurs in special peroxisomes which are called glyoxysomes. This cycle allows seeds to use lipids as a source of energy to form the shoot during germination . The seed cannot produce biomass using photosynthesis because of lack of an organ to perform this function.
The Calvin cycle is present in all photosynthetic eukaryotes and also many photosynthetic bacteria. In plants, these reactions occur in the stroma, the fluid-filled region of a chloroplast outside the thylakoid membranes. These reactions take the products (ATP and NADPH) of light-dependent reactions and perform further chemical processes on them.
It has the highest-energy phosphate bond found (−61.9 kJ/mol) in organisms, and is involved in glycolysis and gluconeogenesis. In plants, it is also involved in the biosynthesis of various aromatic compounds, and in carbon fixation; in bacteria, it is also used as the source of energy for the phosphotransferase system. [1] [2]
The liver can also create glucose (gluconeogenesis, see below); during times of low carbohydrate supply from the digestive system, the liver creates glucose and supplies it to other organs. [4] Most enzymes of glycolysis also participate in gluconeogenesis, as it is mostly the reverse metabolic pathway of glycolysis; a deficiency of these liver ...
The tissue of the swim bladder is known to be very high in glycogenic activity and lacking in gluconeogenesis, yet a predominant amount of Fbp was found to be expressed. This finding suggests that in the gas gland cell, Fbp forms an ATP-dependent metabolic futile cycle.
PEPCK (EC 4.1.1.49) is one of three decarboxylation enzymes used in the inorganic carbon concentrating mechanisms of C 4 and CAM plants. The others are NADP-malic enzyme and NAD-malic enzyme. [17] [18] In C 4 carbon fixation, carbon dioxide is first fixed by combination with phosphoenolpyruvate to form oxaloacetate in the mesophyll.