(4S)-4-hydroxy-L-glutamate + 2-oxoglutarate => (4R)-4-hydroxy-2-oxoglutarate + L-glutamate
(4s)-4-hydroxy-l-glutamate + 2-oxoglutarate => (4r)-4-hydroxy-2-oxoglutarate + l-glutamate
(4S)-4-hydroxy-L-glutamate + 2-oxoglutarate => (4R)-4-hydroxy-2-oxoglutarate + L-glutamate
(4s)-4-hydroxy-l-glutamate + 2-oxoglutarate => (4r)-4-hydroxy-2-oxoglutarate + l-glutamate