Selenium is an essential mineral that is found in a variety of foods, including nuts, seeds, and seafood. It is incorporated into proteins by the enzyme selenocysteine synthase, which converts a cysteine amino acid into selenocysteine.
Selenocysteine is a unique amino acid that contains selenium instead of sulfur. It is found in a variety of proteins, including glutathione peroxidase, which helps to protect cells from damage by free radicals, and thioredoxin reductase, which is involved in the regulation of cell growth and differentiation.
The researchers found that selenocysteine synthase is activated by a small molecule called selenophosphate. Selenophosphate binds to the enzyme and causes it to change shape, which allows it to bind to cysteine and convert it into selenocysteine.
This discovery could lead to new treatments for diseases such as cancer and HIV/AIDS. Selenium has been shown to have anti-cancer and anti-HIV/AIDS properties, and the ability to control the incorporation of selenium into proteins could allow scientists to develop new drugs that are more effective and less toxic.
The study was published in the journal Nature.
