Coenzyme A
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| Coenzyme A | |
|---|---|
| Image:Coenzym A.svg | |
| Image:Coenzyme-A-3D-balls.png | |
| Identifiers | |
| CAS number | |
| PubChem | |
| MeSH | |
| SMILES | CC(C)(COP(=O)(O)OP(=O)(O)OCC1C (C(C(O1)N2C=NC3=C2N=CN=C3N)O) OP(=O)(O)O)C(C(=O)NCCC(=O)NCCS)O |
| Properties | |
| Molecular formula | C21H36N7O16P3S |
| Molar mass | 767.535 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
Coenzyme A (CoA, CoASH, or HSCoA) is a coenzyme, notable for its role in the synthesis and oxidation of fatty acids, and the oxidation of pyruvate in the citric acid cycle. It is adapted from cysteamine, pantothenate, and adenosine triphosphate.
Contents |
Biosynthesis
Coenzyme A is synthesized in a five-step process from pantothenate:
- Pantothenate is phosphorylated to 4'-phosphopantothenate by the enzyme pantothenate kinase
- A cysteine is added to 4'-phosphopantothenate by the enzyme phosphopantothenoylcysteine synthetase to form 4'-phospho-N-pantothenoylcysteine (PPC)
- PPC is decarboxylated to 4'-phosphopantetheine by phosphopantothenoylcysteine decarboxylase
- 4'-phosphopantetheine is adenylylated to form dephospho-CoA by the enzyme phosphopantetheine adenylyl transerase
- Finally, dephospho-CoA is phosphorylated using ATP to coenzyme A by the enzyme dephosphocoenzyme A kinase.
Function
Since coenzyme A is chemically a thiol, it can react with carboxylic acids to form thioesters, thus functioning as an acyl group carrier. It assists in transferring fatty acids from the cytoplasm to mitochondria. A molecule of coenzyme A carrying an acetyl group is also referred to as acetyl-CoA. When it is not attached to an acyl group it is usually referred to as 'CoASH' or 'HSCoA'.
List of coenzyme A activated acyl groups
- Acetyl-CoA
- Propionyl-CoA
- Acetoacetyl-CoA
- Coumaroyl-CoA (used in flavonoid and stilbenoid biosynthesis)
- Acyl derived from dicarboxylic acids
- Malonyl-CoA
- Succinyl-CoA
- Hydroxymethylglutaryl-CoA (used in isoprenoid biosynthesis)
- Pimelyl-CoA (used in biotin biosynthesis)
Additional images
Coenzym A beschriftet.svg
Coenzyme A |
References
- Karl Miller (1998). Beta Oxidation of Fatty Acids. Retrieved May 18, 2005.
- Charles Ophard (2003). Acetyl-CoA Crossroads. Retrieved May 18, 2005.
- Lehninger: Principles of Biochemistry, 4th edition, David L. Nelson, Michael M. Cox
- http://www.elmhurst.edu/~chm/vchembook/621fattyacidrx.html
| Major families of biochemicals | ||
| Peptides | Amino acids | Nucleic acids | Carbohydrates | Nucleotide sugars | Lipids | Terpenes | Carotenoids | Tetrapyrroles | Enzyme cofactors | Steroids | Flavonoids | Alkaloids | Polyketides | Glycosides | ||
| Analogues of nucleic acids: | Types of enzyme cofactors | Analogues of nucleic acids: |
| Coenzymes | NAD+ | NADP+ | Coenzyme A | Tetrahydrofolic acid | Menaquinone | Ascorbic acid | Coenzyme F420 | Adenosine triphosphate | S-Adenosyl methionine | 3'-Phosphoadenosine-5'-phosphosulfate | Coenzyme Q | Tetrahydrobiopterin | Cytidine triphosphate | Glutathione | Coenzyme M | Coenzyme B | Methanofuran | Tetrahydromethanopterin | |
|---|---|---|
| Prosthetic groups | ||
| Organic groups: | Flavin mononucleotide | Flavin adenine dinucleotide | Pyrroloquinoline quinone | Pyridoxal phosphate | Biotin | Methylcobalamin | Cobamamide | Thiamine pyrophosphate | Heme | Molybdopterin | Lipoic acid | |
| Metals: | Calcium | Copper | Iron | Magnesium | Manganese | Nickel | Zinc | |
External links
Template:Metabolic pathway stubde:Coenzym A#Acetyl-CoA eo:Acetila Koenzimo A fr:Coenzyme A id:Koenzim A lb:HSCoA hu:Koenzim A ja:補酵素Afi:Asetyylikoentsyymi-A vi:Coenzyme A uk:Кофермент A
