Individual Metal Cofactors Iron

Most iron enzymes engage iron either as heme or as a special arrangement of iron with sulfur groups referred to as iron-sulfur centers (FenSn). Iron in heme bears a striking resemblance to the magnesium ion in chlorophyll (Figure 2). Heme, which is basically a porphyrin ring system with iron positioned in the center, is the most common form of iron in

Table 3 Important iron enzymes

Enzyme

Source

Function

Form of iron

Cytochrome c

Mitochondria

Electron

Heme

oxidase

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