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Some non-heme iron proteins contain one Fe at their active sites, others have pairs of Fe centers: Many mono-Fe proteins are alpha-ketoglutarate-dependent hydroxylases . Major examples are the lipoxygenases , isopenicillin N synthase , protocatechuate 3,4-dioxygenase , deacetoxycephalosporin-C synthase , [ 1 ] and aromatic amino acid hydroxylases .
Alpha-ketoglutarate-dependent hydroxylases are a major class of non-heme iron proteins that catalyse a wide range of reactions. These reactions include hydroxylation reactions, demethylations, ring expansions, ring closures, and desaturations.
Iron-binding proteins are carrier proteins and metalloproteins that are important in iron metabolism [1] and the immune response. [2] [3] Iron is required for life.Iron-dependent enzymes catalyze a variety of biochemical reactions and can be divided into three broad classes depending on the structure of their active site: non-heme mono-iron, non-heme diiron , or heme centers. [4]
Because iron is a requirement for most plants and animals, a wide range of foods provide iron. Good sources of dietary iron have heme iron, as this is most easily absorbed and is not inhibited by medication or other dietary components. Two examples are red meat and poultry. [30] [31] Non
The same can occur with elements in food, such as calcium, which impacts both heme and non-heme iron absorption. [39] Absorption of iron is better at a low pH (i.e. an acidic environment), and absorption is decreased if there is a simultaneous intake of antacids. Many other substances decrease the rate of non-heme iron absorption. One example ...
The body normally gets the iron it requires from food. If a person consumes too little iron, or iron that is poorly absorbed (non-heme iron), they can become iron deficient over time. Examples of iron-rich foods include meat, eggs, leafy green vegetables and iron-fortified foods.