i did not understand this line-' Metal ions  − basically required to form coordination bonds with side chains of the active site, and with the substrate'-please explain.

Metal ions help in the interaction between the substrate and the active site of enzymes. Metal ions form a type of bond called as coordinate bond. This bond is formed between the atoms in the side chain of substrate and the active site of the enzyme. Thus they help in the catalytic reaction carried out by the enzyme. 

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