These three amino acids are all used commercially as sweetening agents. However, it is not that easy to synthesize these amino acids. There are many factors that are needed in order for synthesis of the right amino acid to occur. Most of the time, selected mutants and clever ways of manipulating a microbe's metabolic pathway are what lead to the synthesis of the desired amino acids. Industries can take advantage of many different types of enzymes that are produced my microbes.
Enzymes are important because they catalyze many different reactions in our bodies.
Different microbes can synthesize different enzymes which are beneficial. For example, A. niger produces the enzymes lipase, oxidase, and pectinase. These enzymes can be used in a wide variety of products. They play a part in cheese production, paper bleaching, and fruit juice production to name a few. Saccharomyces cerevisiae produces the enzyme invertase, which aids in the manufacturing of certain types of candy.