what is thr
Threonine (abbreviated as Thr or T) is an amino acid that is used in the biosynthesis of proteins. It contains an Î±-amino group (which is in the protonated âNH + 3 form under biological conditions), a carboxyl group (which is in the deprotonated âCOO â form under biological conditions), and a side chain containing a hydroxyl group, making it a polar, uncharged amino acid.