Unnatural Amino Acids: Expanding the Horizons of Protein Science
Amino acids are the building blocks of proteins, playing crucial roles in almost every biological process. While the 20 standard amino acids are naturally encoded in the genetic code, scientists have long explored the world beyond these conventional molecules. Unnatural amino acids (UAAs), sometimes called noncanonical or synthetic amino acids, represent a fascinating expansion of nature’s toolkit. These molecules offer unique chemical properties that allow researchers to design proteins with functions not found in nature.
One of the most compelling aspects of unnatural amino acids is their ability to introduce novel chemical functionalities into proteins. For instance, UAAs can carry reactive groups, fluorescent tags, or post-translational modifications that natural amino acids cannot accommodate. This feature enables scientists to study protein dynamics in unprecedented detail. By incorporating UAAs at specific positions within a protein, researchers can observe folding processes, protein–protein interactions, or…
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