Search results
Results from the WOW.Com Content Network
Simplified reaction mechanism of oxalyl-CoA decarboxylase. The unlabeled base is believed to be the 4'-imino group of TPP. A key feature of the cofactor TPP is the relatively acidic proton bound to the carbon atom between the nitrogen and sulfur in the thiazole ring, which has a pKa near 10. [11]
Oxalate oxidase （Enzyme Commission number EC 1.2.3.4 [2] ）occurs mainly in plants. It can degrade oxalic acid into carbon dioxide and hydrogen peroxide. [3]Oxalate decarboxylase (OXDC，EC 4.1.1.2) is a kind of oxalate degrading enzyme containing Mn 2+, [4] found mainly in fungi or some bacteria.
Oxalate (systematic IUPAC name: ethanedioate) is an anion with the chemical formula C 2 O 2− 4.This dianion is colorless. It occurs naturally, including in some foods. It forms a variety of salts, for example sodium oxalate (Na 2 C 2 O 4), and several esters such as dimethyl oxalate ((CH 3) 2 C 2 O 4).
In enzymology, an oxalate decarboxylase (EC 4.1.1.2) is an oxalate degrading enzyme that catalyzes the chemical reaction oxalate + H + ⇌ {\displaystyle \rightleftharpoons } formate + CO 2 Thus, the two substrates of this enzyme are oxalate and H + , whereas its two products are formate and CO 2 .
Rhubarb leaves contain about 0.5% oxalic acid, and jack-in-the-pulpit (Arisaema triphyllum) contains calcium oxalate crystals. Similarly, the Virginia creeper, a common decorative vine, produces oxalic acid in its berries as well as oxalate crystals in the sap, in the form of raphides. Bacteria produce oxalates from oxidation of carbohydrates. [16]
In enzymology, an oxalate oxidase (EC 1.2.3.4) is an oxalate degrading enzyme that catalyzes the chemical reaction: oxalate + O 2 + 2 H + ⇌ {\displaystyle \rightleftharpoons } 2 CO 2 + H 2 O 2 The 3 substrates of this enzyme are oxalate , O 2 , and H + , whereas its two products are CO 2 and H 2 O 2 .
Oxalyl chloride reacts with water giving off gaseous products only: hydrogen chloride (HCl), carbon dioxide (CO 2), and carbon monoxide (CO). (COCl) 2 + H 2 O → 2 HCl + CO 2 + CO In this, it is quite different from other acyl chlorides which hydrolyze with formation of hydrogen chloride and the original carboxylic acid.
Citrate has been shown to inhibit the oxidation of L-malate when there are low levels of L-malate and NAD +. However, in the presence of high levels of malate and NAD +, citrate can stimulate the production of oxaloacetate. Although malate dehydrogenase is typically considered a reversible enzyme, it is believed that there is an allosteric ...