Catechol 2, 3 dioxygenase (C23O) belongs to the class of extradiol dioxygenases that catalyze the cleavage of dihydroxybenzene rings (ex. catechol) with incorporation of dioxygen to yield muconic semialdehyde products. It is an important process to recover the vast quantities of organic carbon sequestered in aromatic compounds from the environment. One third of protein structure studied so far have been identified to bind with metals (5,6). The bound metals are essential for structural stability and electrophilic nature of the enzyme (7-8). A competition is existing between different transition metals for these binding sites as due to the transition metals share same coordination symmetry.
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