Glutamine

Glutamine is one of the 20 naturally occuring amino acids. It can be abbreviated to three letters: 'Gln' or one letter: 'Q' and can be encoded for by 2 different codons, CAA and CAG. Glutamine 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^[1][2].

References

1. ↑ Molecular biology of the cell, Alberts, 5th edition, chapter 3, page 126-129.
2. ↑ Berg, J. M., Tymoczko, J. L., and Stryer, L. (2002). Biochemistry (5th ed.). New York: W.H. Freeman.