B Vitamin Molecular Functions
| Vitamin | Name | Structure | Molecular Function |
|---|---|---|---|
| Vitamin B1 | Thiamine | Thiamine plays a central role in the generation of energy from carbohydrates. It is involved in RNA and DNA production, as well as nerve function. Its active form is a coenzyme called Thiamine pyrophosphate (TPP), which converts pyruvate to acetyl Coenzyme A (CoA) in metabolism . | |
| Vitamin B2 | Riboflavin | Riboflavin is involved in the energy production for the electron transport chain, the citric acid cycle, as well as the catabolism of fatty acids (beta oxidation) | |
| Vitamin B3 | Niacin | Niacin is composed of two structures: nicotinic acid and nicotinamide. There are two co-enzyme forms of niacin: nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP). Both play an important role in energy transfer reactions in the metabolism of glucose, fat and alcohol.
NAD carries hydrogens and their electrons during metabolic reactions, including the pathway from the citric acid cycle to the electron transport chain. NADP is a coenzyme in lipid and nucleic acid synthesis |
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| Vitamin B5 | Pantothenic Acid | Pantothenic Acid is involved in the oxidation of fatty acids and carbohydrates. Coenzyme A, which can be synthesised from panothenic acid, is involved in the synthesis of amino acids, fatty acids, ketones, cholesterol, phospholipids, steroid hormones, neurotransmitters (such as acetylcholine) and antibodies . | |
| Vitamin B6 | Pyridoxine | Pyridoxine is usually stored in the body as pyroxidal-5-phosphate (PLP), which is the co-enzyme form of vitamin B6. Pyridoxine is involved in the metabolism of amino acids and lipids; in the synthesis of neurotransmitters and haemoglobin, as well as in the production of nicotinic acid (vitamin B3) . Pyridoxine also plays an important role in gluconeogenesis | |
| Vitamin B7 | Biotin | Biotin plays a key role in the metabolism of lipids, proteins and carbohydrates. It is a critical co-enzyme of four carboxylases: acetyl CoA carboxylase, which is involved in the synthesis of fatty acids from acetate; propionyl CoA carboxylase, involved in gluconeogenesis; β-methylcrotonyl Coa carboxylase, involved in the metabolism of leucin; and pyruvate CoA carboxylase, which is involved in the metabolism of energy, amino acids and cholesterol . | |
| Vitamin B9 | Folic Acid | Folic acid acts as a co-enzyme in the form of tetrahydrofolate (THF), which is involved in the transfer of single-carbon units in the metabolism of nucleic acids and amino acids. THF is involved in pyrimidine nucleotide synthesis, so is needed for normal cells division, especially during pregnancy and infancy, which are times of rapid growth. Folate also aids in erythropoiesis, the production of red blood cells . | |
| Vitamin B12 | Cobalamin | Vitamin B12 is involved in the cellular metabolism of carbohydrates, proteins and lipids. It is essential in the production of blood cells in bone marrow, nerve sheaths and proteins. Vitamin B12 functions as a co-enzyme in intermediary metabolism for the methionine synthase reaction with methylcobalamin, and the methylmalonyl CoA mutase reaction with adenosylcobalamin |
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Famous quotes containing the word functions:
“Those things which now most engage the attention of men, as politics and the daily routine, are, it is true, vital functions of human society, but should be unconsciously performed, like the corresponding functions of the physical body.”
—Henry David Thoreau (1817–1862)