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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.
Binding of cAMP to the R subunits causes dissociation of the two C subunits, which then can phosphorylate specific acceptor proteins (see Figure 3-27a). Each R subunit has two distinct sites for binding cAMP, called A and B, each located in a different domain in the R subunit.