Threonine

Threonine
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Threonine

Threonine (symbol Thr or T)[2] is an amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH+
3 form under biological conditions), a carboxyl group (which is in the deprotonated −COO form under biological conditions), and a side chain containing a hydroxyl group, making it a polar, uncharged amino acid. It is essential in humans, meaning the body cannot synthesize it: it must be obtained from the diet. Threonine is synthesized from aspartate in bacteria such as E. coli.[3] It is encoded by all the codons starting AC (ACT, ACC, ACA, and ACG).

Threonine sidechains are often hydrogen bonded; the most common small motifs formed are based on interactions with serineST turnsST motifs (often at the beginning of alpha helices) and ST staples (usually at the middle of alpha helices).

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