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KW - 2,3-diphosphoglycerate mutase

KW - 2,3-diphosphoglycerate

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showed the endogeneous substrate to be 2,3-diphosphoglycerate.

2,3-Bisphosphoglycerate (2,3-BPG, also known as2,3-diphosphoglycerate or 2,3-DPG) is a three carbon isomer of theglycolytic intermediate . 2,3-BPG is presentin human red blood cells (RBC; ) atapproximately 5 mmol/L. It binds with greater affinity todeoxygenated hemoglobin (e.g. when the red cell is near respiringtissue) than it does to oxygenated hemoglobin (e.g. in the lungs).In bonding to partially deoxygenated hemoglobin it upregulates the release ofthe remaining oxygen molecules bound to the hemoglobin, thusenhancing the ability of RBCs to release oxygen near tissues thatneed it most.

The role of the left‐shifted or the right‐shifted oxygen‐hemoglobin equilibrium curve

Only 2,3-DPG and ATP are present in substantial concentrations in the erythrocyte.' 2,3-DPG is the most important, as the intra-erythrocytic molar concentration is about four times that of ATP and approximately equal to that of haemoglobin.'*3 Erythrocytes are unique in having such a high concentration of 2,3-DPG.

Red cell 2,3-diphosphoglycerate and oxygen affinity

The cytoplasmic 150 kDa enzyme catalyzed cDPG synthesis from 2,3-diphosphoglycerate (apparent K m =21 mM), Mg 2+ (K m =3.1 mM) and ATP (K m =1–2 mM).

DPG binding between the deoxygenated beta chains changes the shape of Hb (an "allosteric" effect) and this shape change promotes the release of the O2's from the 2 alpha chains at the tissue. When O2loads back onto the beta-globins at the lungs, the 2,3-DPG is physically squeezed out from between the beta chains.

Hb without DPG only releases O2 with 50% efficiency (ie. without DPG, O2 is not unloaded from the alpha chains). Functionally speaking, the effective O2 carrying capacity of Hb without DPG is more similar to that of myoglobin than of normal Hb.

Androgen-Induced Increase in Red-Cell 2,3-Diphosphoglycerate

T1 - Participation of Glyceraldehyde-3-phosphate Dehydrogenase in the Regulation of 2,3-Diphosphoglycerate Level in Erythrocytes

AB - Data are presented concerning the possible participation of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) in regulation of the glycolytic pathway and the level of 2,3-diphosphoglycerate in erythrocytes. Experimental support has been obtained for the hypothesis according to which a mild oxidation of GAPDH must result in acceleration of glycolysis and in decrease in the level of 2,3-diphosphoglycerate due to the acyl phosphatase activity of the mildly oxidized enzyme. Incubation of erythrocytes in the presence of 1 mM hydrogen peroxide decreases 2,3-diphosphoglycerate concentration and causes accumulation of 3-phosphoglycerate. It is assumed that the acceleration of glycolysis in the presence of oxidative agents described previously by a number of authors could be attributed to the acyl phosphatase activity of GAPDH. A pH-dependent complexing of GAPDH and 3-phosphoglycerate kinase or 2,3-diphosphoglycerate mutase is found to determine the fate of 1,3-diphosphoglycerate that serves as a substrate for the synthesis of 2,3-diphosphoglycerate as well as for the 3-phosphoglycerate kinase reaction in glycolysis. A withdrawal of the two-enzyme complexes from the erythrocyte lysates using Sepharose-bound anti-GAPDH antibodies prevents the pH-dependent accumulation of the metabolites. The role of GAPDH in the regulation of glycolysis and the level of 2,3-diphosphoglycerate in erythrocytes is discussed.

Each subunit in Figure 2 contains regions with a coiled shape;many of the amino acids that make up the polypeptide chaininteract to form this particular structure, called an alphahelix. In an alpha helix (Figure 3), each amino acid is"hydrogen-bonded" to the amino acid that is fourresidues ahead of it in the chain. In hemoglobin, thehydrogen-bonding interaction occurs between the H of an -NH groupand the O of a -CO group of the polypeptide backbone chain; theamino-acid side chains extend outward from the backbone of thehelix. Approximately 75% of the amino-acid composition ofhemoglobin adopts an alpha-helical structure. Another commonstructural motif is the beta-pleated sheet, in which amino acidsline up in straight parallel rows.

Therefore an increase in 2,3-DPG concentration improves tissue oxygenation whereas a decrease in 2,3-DPG concentration may lead to tissue hypoxia.
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  • More info on 2,3-Bisphosphoglycerate ..

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Human 2,3-Diphosphoglycerate,2,3-DPG ELISA Kit | …

This mechanism depends on the interaction of haemoglobin with intra-erythrocytic organic phosphates, approximately 80 % of which are composed of 2,3-diphosphoglycerate (2,3-DPG) and adenosine triphosphate (ATP).

2,3 diphosphoglycerate - Revolvy

In 1 9 6 7 ' ~it was shown that ~ 2,3-DPG alters the oxygen affinity of haemoglobin, such that an increase in the intraerythrocytic 2,3-DPG concentration reduces the affinity of haemoglobin for oxygen and vice-versa.

early stimulate 2,3-bisphosphoglycerate (2,3-BPG) synthesis during ..

2. In cytokine mediated illness the production of central and locally generated cytokines can affect the de-iodination pathways of thyroid hormones. It seems that high level of rT3, and low levels of T2 may ensue. Reverse T3 is a non-competitive inhibitor of T3 and is raised in stress situations. T2 is thought to be important for the functioning of mitochondria. High levels of rT3 have been found in post-operative patients subsequent to high cortisol output. It is thought to be an adaptive response in order to conserve energy. The situation of poor conversion of serum T4 to cellular T3, for whatever reason, has been called Wilson's Thyroid Syndrome.

2 3-Diphosphoglycerate | All About Blood

Vogels Department of Microbiology, Faculty of Science University of Nijmegen NL-6525 ED Nijmegen The Netherlands Abstract The levels of cyclic 2,3-diphosphoglycerate (cDPG) in methanogenic bacteria are governed by the antagonistic activities of cDPG synthetase and cDPG hydrolase.

Posts about 2 3-Diphosphoglycerate written by Avinash Deo

Kavanaugh, J.S. et al. "High-resolution x-raystudy of deoxyhemoglobin Rothschild 37beta trp->arg: amutation that creates an intersubunit chloride-bindingsite," (1992) Biochemistry, 31,4111. Deoxyhemoglobin PDB coordinates, Brookhaven ProteinData Bank.

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