It is the only achiral proteinogenic amino acid. Glycine is also an inhibitory neurotransmitter – interference with its release within the spinal cord (such as during a Clostridium tetani infection) can cause spastic paralysis due to uninhibited muscle contraction. For the same reason, it is the most abundant amino acid in collagen triple-helices. Glycine is integral to the formation of alpha-helices in secondary protein structure due to its compact form. It is encoded by all the codons starting with GG (GGU, GGC, GGA, GGG). Glycine is one of the proteinogenic amino acids. It is the simplest stable amino acid ( carbamic acid is unstable), with the chemical formula NH 2‐ CH 2‐ COOH. Glycine (symbol Gly or G / ˈ ɡ l aɪ s iː n/ ( listen)) is an amino acid that has a single hydrogen atom as its side chain.
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