EC 4.2.3.1     
Accepted name: threonine synthase
Reaction: O-phospho-L-homoserine + H2O = L-threonine + phosphate
Other name(s): threonine synthetase; O-phospho-L-homoserine phospho-lyase (adding water)
Systematic name: O-phospho-L-homoserine phosphate-lyase (adding water; L-threonine-forming)
Comments: A pyridoxal-phosphate protein.
References:
1.  Flavin, M. and Slaughter, C. Purification and properties of threonine synthetase of Neurospora. J. Biol. Chem. 235 (1960) 1103–1108. [PMID: 13823379]
[EC 4.2.3.1 created 1961 as EC 4.2.99.2, transferred 2000 to EC 4.2.3.1]