Glutamine is one of the 20 naturally occuring amino acids. It can be abbreviated to three letters: Gln or one letter: Q. It is a polar molecule meaning that it has an enzymatic role and can bind ligands and other DNA. Polar amino acids are found buried in a protein and can be hydrogen-bonded to other polar amino acids or to the polypeptide backbone .
Berg, J. M., Tymoczko, J. L., & Stryer, L. (2002). Biochemistry (5th ed.). New York: W.H. Freeman.
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