The enzyme is involved in the de novo synthesis of adenosylcobalamin. It is specific for ATP and free L-threonine. In the bacterium Salmonella enterica the activity with CTP, GTP, or UTP is 6, 11, and 3% of the activity with ATP.
Enzymatic reactions [BR:br08201]
2. Transferase reactions
2.7 Transferring phosphorus-containing groups
2.7.1 Phosphotransferases with an alcohol group as acceptor
2.7.1.177
R06531 L-Threonine + ATP <=> L-Threonine O-3-phosphate + ADP