Dec-4-enedioyl-CoA (BioDeep_00000004545)

描述信息

Dec-4-enedioyl-coa, also known as 2-methylbutanoyl-CoA is an acyl-CoA or acyl-coenzyme A. More specifically, it is a dec-4-enedioic acid thioester of coenzyme A. Dec-4-enedioyl-coa is an acyl-CoA with 10 fatty acid group as the acyl moiety attached to coenzyme A. Coenzyme A was discovered in 1946 by Fritz Lipmann (Journal of Biological Chemistry (1946) 162 (3): 743–744) and its structure was determined in the early 1950s at the Lister Institute in London. Coenzyme A is a complex, thiol-containing molecule that is naturally synthesized from pantothenate (vitamin B5), which is found in various foods such as meat, vegetables, cereal grains, legumes, eggs, and milk. More specifically, coenzyme A (CoASH or CoA) consists of a beta-mercaptoethylamine group linked to the vitamin pantothenic acid (B5) through an amide linkage and 3-phosphorylated ADP. Coenzyme A is synthesized in a five-step process that requires four molecules of ATP, pantothenate and cysteine. It is believed that there are more than 1100 types of acyl-CoA’s in the human body, which also corresponds to the number of acylcarnitines in the human body. Acyl-CoAs exists in all living species, ranging from bacteria to plants to humans. The general role of acyl-CoA’s is to assist in transferring fatty acids from the cytoplasm to mitochondria. This process facilitates the production of fatty acids in cells, which are essential in cell membrane structure. Acyl-CoAs are also susceptible to beta oxidation, forming, ultimately, acetyl-CoA. Acetyl-CoA can enter the citric acid cycle, eventually forming several equivalents of ATP. In this way, fats are converted to ATP -- or biochemical energy. Acyl-CoAs can be classified into 9 different categories depending on the size of their acyl-group: 1) short-chain acyl-CoAs; 2) medium-chain acyl-CoAs; 3) long-chain acyl-CoAs; and 4) very long-chain acyl-CoAs; 5) hydroxy acyl-CoAs; 6) branched chain acyl-CoAs; 7) unsaturated acyl-CoAs; 8) dicarboxylic acyl-CoAs and 9) miscellaneous acyl-CoAs. Short-chain acyl-CoAs have acyl-groups with two to four carbons (C2-C4), medium-chain acyl-CoAs have acyl-groups with five to eleven carbons (C5-C11), long-chain acyl-CoAs have acyl-groups with twelve to twenty carbons (C12-C20) while very long-chain acyl-CoAs have acyl groups with more than 20 carbons. Dec-4-enedioyl-coa is therefore classified as a medium chain acyl-CoA. The oxidative degradation of fatty acids is a two-step process, catalyzed by acyl-CoA synthetase/synthase. Fatty acids are first converted to their acyl phosphate, the precursor to acyl-CoA. The latter conversion is mediated by acyl-CoA synthase. Three types of acyl-CoA synthases are employed, depending on the chain length of the fatty acid. Dec-4-enedioyl-coa, being a medium chain acyl-CoA is a substrate for medium chain acyl-CoA synthase. The second step of fatty acid degradation is beta oxidation. Beta oxidation occurs in mitochondria and, in the case of very long chain acyl-CoAs, the peroxisome. After its formation in the cytosol, Dec-4-enedioyl-CoA is transported into the mitochondria, the locus of beta oxidation. Transport of Dec-4-enedioyl-CoA into the mitochondria requires carnitine palmitoyltransferase 1 (CPT1), which converts Dec-4-enedioyl-CoA into Dec-4-enedioylcarnitine, which gets transported into the mitochondrial matrix. Once in the matrix, Dec-4-enedioylcarnitine is converted back to Dec-4-enedioyl-CoA by CPT2, whereupon beta-oxidation can begin. Beta oxidation of Dec-4-enedioyl-CoA occurs in four steps. First, since Dec-4-enedioyl-CoA is a medium chain acyl-CoA it is the substrate for a medium chain acyl-CoA dehydrogenase, which catalyzes dehydrogenation of Dec-4-enedioyl-CoA, creating a double bond between the alpha and beta carbons. FAD is the hydrogen acceptor, yielding FADH2. Second, Enoyl-CoA hydrase catalyzes the addition of water across the newly formed double bond to make an alcohol. Third, 3-hydroxyacyl-CoA dehydrogenase oxidizes the alcohol group to a ket...
a-Methylbutyryl-CoA is a a product of isoleucine catabolism. It is converted to Tiglyl-CoA by short/branched-chain acyl-CoA dehydrogenase. 2-Methylbutyryl-CoA dehydrogenase deficiency, also called 2-Methyl-3-hydroxybutyryl-CoA dehydrogenase deficiency or MBHD, is an inherited disorder in which the body is unable to process the amino acid isoleucine properly. It is caused by a mutation in the HADH2 gene. Untreated MBHD can lead to progressive loss of motor skills, to mental retardation and to epilepsy. 2-Methylbutyryl-CoA is a substrate for Acyl-CoA dehydrogenase (short-chain specific, mitochondrial), Acyl-CoA dehydrogenase (medium-chain specific, mitochondrial) and Acyl-CoA dehydrogenase (long-chain specific, mitochondrial). [HMDB]

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