4.1.1.81 L-serine O-3-phosphate - ethanolamine-phosphate + CO2 - ? 444353 4.1.1.81 L-threonine O-3-phosphate - (R)-1-aminopropan-2-yl phosphate + CO2 - ? 359177 4.1.1.81 L-threonine O-3-phosphate enzyme shows stereospecificity for the L-isomer, unable to decarboxylate the D-isomer (R)-1-aminopropan-2-yl phosphate + CO2 - ? 359177 4.1.1.81 L-threonine O-3-phosphate adenosylcobalamin biosynthesis, end product of the corrin ring biosynthetic pathway is 5'-deoxyadenosylcobinamide phosphate, not 5'-deoxyadenosylcobinamide (R)-1-aminopropan-2-yl phosphate + CO2 - ? 359177 4.1.1.81 L-threonine O-3-phosphate biosynthetic pathway of cobalamin, essential cofactor for many living organisms, only synthesized de novo by bacteria and archaea (R)-1-aminopropan-2-yl phosphate + CO2 precursor for the linkage between the nucleotide loop and the corrin ring in cobalamin ? 359177 4.1.1.81 L-threonine O-3-phosphate de novo synthesis of enzymatic cofactors, cobalamin biosynthetic pathway (R)-1-aminopropan-2-yl phosphate + CO2 precursor for the linkage between the nucleotide loop and the corrin ring in cobalamin ? 359177 4.1.1.81 additional information CobD does not have lactaldehyde aminotransferase activity ? - ? 89 4.1.1.81 additional information bifunctional enzyme with L-threonine-O-3-phosphate decarboxylase (EC 4.1.1.81) and L-Thr kinase activities (EC 2.7.1.177). Using ATP and L-Thr as substrates, the enzyme generates ADP, L-Thr-P, and (R)-1-aminopropan-2-ol O-phosphate as products. No substrate: L-serine phosphate ? - ? 89