Isocitric Acid

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isocitric acid

[¦ī·sə¦si·trik ′as·əd]
(biochemistry)
HOOCCH2CH(COOH)CH(OH)COOH An isomer of citric acid that is involved in the Krebs tricarboxylic acid cycle in bacteria and plants.

Isocitric Acid

 

an organic tricarboxylic acid; one of the intermediate substrates of the tricarboxylic acid cycle.

Isocitric acid forms in an organism from citric acid and cisaconitic acid as a result of enzymatic conversion. With involvement of the enzyme isocitrate dehydrogenase, isocitric acid is converted, through oxalosuccinic acid, to α-ketoglutaric acid. With the aid of the enzyme isocitratelyase in the glyoxalate cycle, isocitric acid decomposes to succinic and glyoxylic acids.

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Correlation of the genetic changes in the study ATRX p53 IDH1 IDH2 IDH1 mut mut mut exp 1p/19q -0.699 (*) -0.659 (*) -0.139 0.255 0.430 deletion ATRX mut 0.528 (*) 0.447 (*) -0.205 0.100 p53 -0.143 -0.229 -0.189 IDH1 mut -0.459 0.485 (*) IDH2 mut -0.414 IDH1exp CEP4 1p/19q -0.234 deletion ATRX mut 0.269 p53 0.234 IDH1 mut 0.333 IDH2 mut -0.293 IDH1exp 0.015 (*) p<0.05; ATRX: alpha thalassemia/mental retardation syndrome; IDH: isocitrate dehydrogenase TABLE 3.
The product (ivosidenib) is an isocitrate dehydrogenase-1 (IDH1) inhibitor indicated in the United States as a treatment for acute myeloid leukaemia with a susceptible IDH1 mutation under the conditions where in patients with newly diagnosed IDH1-susceptible acute myeloid leukaemia who are up to 75 years old or have comorbidities that preclude the use of intensive induction chemotherapy and in adult patients with R/R AML with a susceptible IDH1 mutation as detected by an FDA-approved test.
In addition, significant decreases were observed in the activities of pyruvate dehydrogenase complex (-41%), isocitrate dehydrogenase (-27%), and [alpha]-ketoglutarate dehydrogenase complex (-57%).
IDHs are homodimeric enzymes in the Krebs cycle that normally catalyze the oxidative carboxylation of isocitrate to [alpha]-ketoglutarate ([alpha]-KG; Figure 6).
Since 2012, histopathological markers such as MGMT, isocitrate dehydrogenase 1, and IP 19Q have become integral in the diagnosis and treatment of malignant brain tumors such as astrocytoma, oligodendroglioma, and glioblastoma (Fig 1).
0.34 mM EDTA, 0.03% glutin, 1.5 mM D, L- isocitrate and 0.1 mL supernatant.
The Ki-67 labeling index was very low (approximately 2%), and all tumor cells were negative for p53, isocitrate dehydrogenase (IDH1-R132H), and cytokeratin 7.
They investigated 914 subjects (patients with PDAC, ChP, liver cirrhosis, and healthy cohorts) and identified a metabolic biomarker signature comprising 9 metabolites (histidine, proline, sphingomyelin d18:2, sphingomyelin d17:1, phosphatidylcholine, isocitrate, sphingagine1-phosphate, pyruvate, and ceramide), which was used in conjunction with CA19-9 to detect PDAC with a much higher diagnostic accuracy than CA19-9 alone.
tuberculatum venom can be grouped basically into proteins involved in insect metabolism (annexin B9, nucleoside diphosphate kinase; aconitate hydratase; superoxide dismutase; triose phosphate isomerase; glyceraldehyde-3phosphate dehydrogenase; succinyl-CoA ligase; fructosebisphosphate aldolase; arginine kinase; citrate synthase; enolase; ATP synthase; 4-hydroxybutyrate coenzyme A transferase; medium-chain specific acyl-CoA dehydrogenase, and isocitrate dehydrogenase); transport protein (transferrin); and structural proteins (cyclophilin, actin, and chitinase).
Most notably, isocitrate dehydrogenase (IDH) mutational status has been included to define diagnostic categories of astrocytomas.
The cytotoxic effect is associated with the inhibition of the enzyme isocitrate lyase [68].
Citrate is converted into isocitrate by the aconitase (AC), which is further converted to [alpha]-Ketoglutarate via the isocitrate dehydrogenase (IDH) producing NADH from NAD in the process.