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1. In some cases, the cofactor completes the active site of the enzyme or modifies it in such a manner that substrate binding can ensue. 2. The cofactor acts as a donor of electrons or atoms to the substrate and following the reaction is returned to its former state.
Enzyme cofactors. What we have said so far is a major over-simplification for most enzymes. Most enzymes aren't in fact just pure protein molecules. Other non-protein bits and pieces are needed to make them work. These are known as cofactors. In the absence of the right cofactor, the enzyme doesn't work.