Vitamin C (Ascorbic Acid) Biochemistry
21396
Summary
Vitamin C (Ascorbic Acid) is a water-soluble vitamin important as a cofactor for hydroxylase enzymes. It is a cofactor for dopamine beta-hydroxylase, facilitating the conversion of dopamine to norepinephrine. Vitamin C is also involved in collagen synthesis, as a cofactor for hydroxylation of proline and lysine residues. As an antioxidant, Vitamin C also plays an important role in the reduction of iron (III) to iron (II), which is required for enteric absorption of iron. This property also makes vitamin C useful as an ancillary treatment for methemoglobinemia.
Key Points
- Ascorbic Acid (Vitamin C)
- Water-soluble antioxidant found in fruits and vegetables
- Reduces iron: Fe3+ to Fe2+
- Facilitates iron absorption at GI tract
- Mechanism of treatment for methemoglobinemia
- Key roles in hydroxylase enzymes
- Hydroxylation of proline and lysine residues (in Collagen Synthesis)
- prolyl and lysyl hydroxylases
- dopamine B–hydroxylase, converts dopamine to norepinephrine (in Catecholamine Synthesis)
- Hydroxylation of proline and lysine residues (in Collagen Synthesis)
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