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B. An Enzyme Linked To How We Age And Die

Narrator: This is Science Today. An enzyme that repairs damaged proteins in the cell may play a vital role in how organisms age and die. Researcher Edward Kim of the University of California, San Francisco's Gladstone Institute, says this enzyme, called PCMT is widely expressed.

Kim: Meaning that even very simple organisms seem to rely on this enzyme and within humans and mice, this enzyme seems to be expressed in every single tissue examined to date.

Narrator: In the lab, genetically engineered organisms without this enzyme died prematurely because there was nothing to repair the accumulating, damaged proteins.

Kim: Alzheimer's Disease and other age related diseases such as cataracts, 046 seem to be correlated with the accumulation of naturally deteriorated proteins. I'm not saying that defects in this enzyme are a major cause of these age related diseases, but they may be useful diagnostic and therapeutic targets in the future to afford these diseases.

Narrator: For Science Today, I'm Larissa Branin.