| abstract |
Threonine or isoleucine is be produced by culturing a bacterium belonging to the genus Escherichia, which has an ability to produce L-threonine or L-isoleucine, and in which intracellular phosphoenolpyruvate carboxylase activity and transhydrogenase activity are enhanced, in a medium to produce and accumulate threonine or isoleucine in the medium, and collecting the threonine or isoleucine from the medium. |