Phosphothreonine is a phosphoamino acid, the phosphorylated ester of threonine. There are three amino acids that are typically phosphorylated in eukaryotes: serine, threonine, and tyrosine. Threonine residues in endogenous proteins undergo phosphorylation through the action of a threonine kinase. Small amounts of free phosphothreonine can be detected in urine [PMID: 7693088]. Antibodies against phosphothreonine can be used as an identifier in the analysis of peptides, proteins, and enzymes. [National Center for Biotechnology Information. PubChem Compound Database; CID=3246323]
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Protein Aliases: C4H10NO6P; L-Threonine O-phosphate; L-Threonine phosphate; O-phospho-L-threonine; Phospho-threonine; pThr; Threonine; Threoninium dihydrogen phosphate