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Upon heating in cyclohexanone, amino acids decarboxylate. In the related Hammick reaction, uncatalyzed decarboxylation of a picolinic acid gives a stable carbene that attacks a carbonyl electrophile. Oxidative decarboxylations are generally radical reactions. These include the Kolbe electrolysis and Hunsdiecker-Kochi reactions.
Pyruvate dehydrogenase complex reaction. Pyruvate decarboxylation or pyruvate oxidation, also known as the link reaction (or oxidative decarboxylation of pyruvate [1]), is the conversion of pyruvate into acetyl-CoA by the enzyme complex pyruvate dehydrogenase complex. [2] [3] The reaction may be simplified as:
For simple decarboxylation reaction, the enzyme involved in this reaction is pyruvate decarboxylase, which is different from oxidative decarboxylation. During the reaction, pyruvate is directly connected with the thiazole ring of TPP, and the carboxyl group on pyruvate is removed after the connection to generate carbon dioxide.
This can react as a nucleophile at the ketone carbon of pyruvic acid. [3] During the decarboxylation of pyruvate, the TPP stabilizes the carbanion intermediates as an electrophile by noncovalent bonds. [4] Specifically, the pyridyl nitrogen N1' and the 4'-amino group of TPP are essential for the catalytic function of the enzyme-TPP complex. [5]
Aromatic-L-amino-acid decarboxylase; Glutamate decarboxylase; Histidine decarboxylase; Ornithine decarboxylase; Phosphoenolpyruvate carboxylase; Pyruvate decarboxylase; RuBisCO – the only carboxylase that leads to a net fixation of carbon dioxide; Uridine monophosphate synthetase; Uroporphyrinogen III decarboxylase; enoyl-CoA carboxylases ...
Transamination is a chemical reaction that transfers an amino group to a ketoacid to form new amino acids.This pathway is responsible for the deamination of most amino acids. This is one of the major degradation pathways which convert essential amino acids to non-essential amino acids (amino acids that can be synthesized de novo by the organism).
There are several Akabori amino acid reactions, which are named after Shirō Akabori (Japanese: 赤堀 四郎) (1900–1992), a Japanese chemist. In the first reaction, an α- amino acid is oxidised and undergoes decarboxylation to give an aldehyde at the former α position by heating with oxygen in the presence of a reducing sugar .
The enzyme ornithine decarboxylase (EC 4.1.1.17, ODC) catalyzes the decarboxylation of ornithine (a product of the urea cycle) to form putrescine. This reaction is the committed step in polyamine synthesis. [1] In humans, this protein has 461 amino acids and forms a homodimer. [2] In humans, ornithine decarboxylase (ODC) is expressed by the ...