Branched-chain-2-oxoacid decarboxylase

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branched-chain-2-oxoacid decarboxylase
branched-chain-2-oxoacid decarboxylase
Identifiers
EC no.	4.1.1.72
CAS no.	63653-19-0
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / QuickGO
PMC
Search
PMC	articles
PubMed	articles
NCBI	proteins

Last updated August 27, 2023

The enzyme branched-chain-2-oxoacid decarboxylase (EC 4.1.1.72) catalyzes the chemical reaction

(3S)-3-methyl-2-oxopentanoate

\rightleftharpoons

2-methylbutanal + CO₂

This enzyme belongs to the family of lyases, specifically the carboxy-lyases, which cleave carbon-carbon bonds. The systematic name of this enzyme class is (3S)-3-methyl-2-oxopentanoate carboxy-lyase (2-methylbutanal-forming). Other names in common use include branched-chain oxo acid decarboxylase, branched-chain alpha-keto acid decarboxylase, branched-chain keto acid decarboxylase, BCKA, and (3S)-3-methyl-2-oxopentanoate carboxy-lyase.

Related Research Articles

Carboxy-lyases, also known as decarboxylases, are carbon–carbon lyases that add or remove a carboxyl group from organic compounds. These enzymes catalyze the decarboxylation of amino acids, beta-keto acids and alpha-keto acids.

In biochemistry, fatty acid synthesis is the creation of fatty acids from acetyl-CoA and NADPH through the action of enzymes called fatty acid synthases. This process takes place in the cytoplasm of the cell. Most of the acetyl-CoA which is converted into fatty acids is derived from carbohydrates via the glycolytic pathway. The glycolytic pathway also provides the glycerol with which three fatty acids can combine to form triglycerides, the final product of the lipogenic process. When only two fatty acids combine with glycerol and the third alcohol group is phosphorylated with a group such as phosphatidylcholine, a phospholipid is formed. Phospholipids form the bulk of the lipid bilayers that make up cell membranes and surrounds the organelles within the cells.

The enzyme 2,2-dialkylglycine decarboxylase (pyruvate) (EC 4.1.1.64) catalyzes the chemical reaction

The enzyme 3-dehydro-L-gulonate-6-phosphate decarboxylase (EC 4.1.1.85) catalyzes the chemical reaction

The enzyme 3-oxolaurate decarboxylase (EC 4.1.1.56) catalyzes the chemical reaction

The enzyme 5-guanidino-2-oxopentanoate decarboxylase (EC 4.1.1.75) catalyzes the chemical reaction

THe enzyme 6-methylsalicylate decarboxylase (EC 4.1.1.52) catalyzes the chemical reaction

The enzyme acetolactate decarboxylase (EC 4.1.1.5) catalyzes the chemical reaction

The enzyme aconitate decarboxylase (EC 4.1.1.6) catalyzes the chemical reaction

<span class="mw-page-title-main">Aminocarboxymuconate-semialdehyde decarboxylase</span>

The enzyme aminocarboxymuconate-semialdehyde decarboxylase (EC 4.1.1.45) catalyzes the chemical reaction

<span class="mw-page-title-main">Aspartate 4-decarboxylase</span>

In enzymology, an aspartate 4-decarboxylase (EC 4.1.1.12) is an enzyme that catalyzes the chemical reaction

The enzyme dehydro-L-gulonate decarboxylase (EC 4.1.1.34) catalyzes the chemical reaction

The enzyme gallate decarboxylase (EC 4.1.1.59) catalyzes the chemical reaction

The enzyme indolepyruvate decarboxylase (EC 4.1.1.74) catalyzes the chemical reaction

<span class="mw-page-title-main">Methylmalonyl-CoA decarboxylase</span>

In enzymology, a methylmalonyl-CoA decarboxylase (EC 7.2.4.3) is an enzyme that catalyzes the chemical reaction

The enzyme phenylalanine decarboxylase (EC 4.1.1.53) catalyzes the chemical reaction

The enzyme protocatechuate decarboxylase (EC 4.1.1.63) catalyzes the chemical reaction

<span class="mw-page-title-main">Sulfinoalanine decarboxylase</span>

The enzyme sulfinoalanine decarboxylase (EC 4.1.1.29) catalyzes the chemical reaction

The enzyme UDP-galacturonate decarboxylase (EC 4.1.1.67) catalyzes the chemical reaction

In enzymology, a phenacrylate decarboxylase (EC 4.1.1.102) is an enzyme that catalyzes the chemical reaction

References

Oku H, Kaneda T (1988). "Biosynthesis of branched-chain fatty acids in Bacillus subtilis. A decarboxylase is essential for branched-chain fatty acid synthetase". J. Biol. Chem. 263 (34): 18386–96. PMID 3142877.

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v t e Carbon–carbon lyases (EC 4.1)
4.1.1: Carboxy-lyases	Acetoacetate decarboxylase Adenosylmethionine decarboxylase Arginine decarboxylase Aromatic L-amino acid decarboxylase Glutamate decarboxylase Histidine decarboxylase Lysine decarboxylase Malonyl-CoA decarboxylase Ornithine decarboxylase Oxaloacetate decarboxylase Phosphoenolpyruvate carboxykinase Phosphoenolpyruvate carboxylase Phosphoribosylaminoimidazole carboxylase Pyrophosphomevalonate decarboxylase Pyruvate decarboxylase RuBisCO Uridine monophosphate synthetase/Orotidine 5'-phosphate decarboxylase Uroporphyrinogen III decarboxylase
4.1.2: Aldehyde-lyases	Fructose-bisphosphate aldolase Aldolase A Aldolase B Aldolase C 2-hydroxyphytanoyl-CoA lyase Threonine aldolase
4.1.3: Oxo-acid-lyases	Isocitrate lyase 3-hydroxy-3-methylglutaryl-CoA lyase
4.1.99: Other	Tryptophanase Photolyase CPD lyase Spore photoproduct lyase

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Coenzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)