Main Reaction: Threonine >> 2-Ketobutyrate + NH3

Reference: PubMed ID: 23376654
Authors: Shen CR, Liao JC
Title: Synergy as design principle for metabolic engineering of 1-propanol production in Escherichia coli.
Published: 2013 May

Threonine --> 2-Ketobutyrate + NH3