| abstract |
(57) [Summary] [Purpose] L-, which is useful as an amino acid preparation and feed additive Provided is a method for producing threonine or L-isoleucine in good yield at low cost. [Structure] L-threonine or L-isoleucine is produced by using a microorganism belonging to the genus Escherichia, having resistance to a purine analog, and having an ability to produce L-threonine or L-isoleucine. |