An enzyme's three dimension shape is important to the binding that occurs between the enzyme itself and its specific substrate, forming the enzyme-substrate complex. In order for the enzyme to create a reaction it is important that the shape of the enzyme binds the substrate to the active site where the chemical reaction occurs. One other thing to consider is the shape that the enzyme takes that allows only its specific substrate to bind and not any other molecule.

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it is important because the shape of h2o2 must be complementary to the shape of the active site of the calase enzyme. Enzyme substarate complex can be formed and enzyme product complex can then be formed. If h202 shape was not complementary of the shape of the active site of catalase h202 could not be broken down into water and oxygen. Without the enzyme present it would take days for the h202 to break down. It would eventually break but it would take a long time. So the shape is important because without h202 would not be able to bind with the active site.

Enzymes are protiens. If you get the balance of pH or temperature outof wack, you can change the shape of the enzyme. Changing the shape of the said enzyme damages the protein, so it cannot do its job. This is called denaturing.

Shape of an enzyme specifically shape of its active site determines enzyme specificity .