Enzymes are quite amazing. An enzyme works by lowering the activation energy of the substrate to allow chemical reactions to occur at a faster rate. With the absence of enzymes, life will cease to exist as we know it. Vincent Fischetti and colleagues at Rockefeller University in New York isolated the enzyme, called Pal, from a bacteriophage (a type of virus that infects bacteria) that targets S. pneumoniae. The bacterium Streptococcus pneumoniae can cause problems ranging from ear infections to potentially deadly diseases like pneumonia and meningitis and is found in the nose and throat of humans.
The enzyme isolated from the bacteriophage displayed specificity as it only affected the bacterium and did not affect any other bacteria that are found in the nose. Again due to the specificity of the enzyme, the bacterium does not seem to develop any resistance to the enzyme as they do with antibiotic drugs.
Indeed the enzyme is very important. Not only in the requirement to speed up a reaction, but as seen with the bacterium Streptococcus pneumonia, it can also be used medically to protect from potentially dangerous diseases.