Pentose - an overview | ScienceDirect Topics
2011年6月5日 · The pentose can be either D-ribose as in ribonucleic acid (RNA) or 2-deoxyribose as in deoxyribonucleic acid (DNA). A nucleotide is a phosphate ester of a nucleoside. The most common site of esterification is carbon No. 5 of the pentose, this is referred to as a 5’ nucleotide.
Pentose - an overview | ScienceDirect Topics
Pentose Phosphate (Hexose Mono Phosphate) Pathway. Bernard R. Landau, in Encyclopedia of Biological Chemistry, 2004. Other Functions. The pentose phosphate pathway is the route by which pentose from food is metabolized. Erythrose-4-P in some organisms is used as an intermediate in the synthesis of the aromatic ring of the amino acids.
Pentose - an overview | ScienceDirect Topics
Pentose fermenting yeasts require a careful control for maintaining low oxygen levels in the culture medium needed for their oxidative metabolism. Additionally, these yeasts successfully ferment pure xylose, but not the aqueous hemicellulose flows generated during the biomass pretreatment, probably due to the presence of different inhibitors ...
Pentose - an overview | ScienceDirect Topics
D-ribose, a pentose monosaccharide naturally produced by the human body and not found in food sources, L-lyxose also is a pentose monosaccharide, a C-2 carbon epimer of the sugar xylose. Sucrose generally known as table sugar, a disaccharide composed of two monosaccharides glucose and fructose while malic acid, an organic compound, a ...
Pentose - an overview | ScienceDirect Topics
The pentose phosphate pathway is an important source of energy in many microorganisms. Glucose can be oxidized with the liberation of electron pairs, which may enter an electron transport system. However, its major role appears to be for biosynthesis.
Pentose - an overview | ScienceDirect Topics
The pentose phosphate pathway is the route by which pentose from food is metabolized. Erythrose-4-P in some organisms is used as an intermediate in the synthesis of the aromatic ring of the amino acids. d-Xylulose formed in the glucuronic acid pathway is further metabolized via the pentose phosphate pathway.
Pentose Phosphate - an overview | ScienceDirect Topics
The pentose phosphate pathway is also important in red blood cells, where the NADPH is required to maintain an adequate pool of reduced glutathione (GSH), the reducing agent for glutathione peroxidase, which reduces H 2 O 2 → H 2 O and O 2. Oxidized glutathione (GSSG) is reduced back to active GSH by glutathione reductase, which uses NADPH as ...
Pentose - an overview | ScienceDirect Topics
Pentose Phosphate (Hexose Mono Phosphate) Pathway. B.R. Landau, in Encyclopedia of Biological Chemistry (Second Edition), 2013. Other Functions. The pentose phosphate pathway is the route by which pentose from food is metabolized. Erythrose-4-P in some organisms is used as an intermediate in the synthesis of the aromatic ring of the amino acids.
Pentose - an overview | ScienceDirect Topics
In these yeasts, little to no pentose phosphoketolase activity was detected when they were grown on glucose. In contrast, pentose phosphoketolase activity increased greatly (∼70-fold) when they were grown on xylose as the sole carbon-energy source. This suggested that the PPK pathway is a major means of pentose catabolism in these microbes.
Pentose - an overview | ScienceDirect Topics
The pentose may be either ribose (ribonucleoside) or 2'-deoxyribose (deoxyribonucleoside) bound by the C1 atom through a glycosidic linkage to the N9 atom of the purine group, or to the N2 of the pyrimidine group (Figure 1). The importance of purine and pyrimidine nucleotides in cellular metabolism is twofold.