Benefit or Harm to Life Based on an Enzyme/Lack of Enzyme

Find an example of benefit or harm to life that hinges on an enzyme. For example, some diseases are the result of an underproduction or overproduction of a vital enzyme. Also, some substances that are considered poisons or pollutants do their harm by interfering with the function of a vital enzyme.

Identify the enzyme, the important role it plays, and how its action can be disrupted