. "Catalysis of the reaction: erythro-3-hydroxy-L-aspartate = NH3 + oxaloacetic acid." . . "3-hydroxyaspartate dehydratase activity" . "erythro-3-hydroxyaspartate ammonia-lyase activity" . "erythro-3-hydroxy-L(s)-aspartate hydro-lyase (deaminating) activity" . "erythro-3-hydroxy-Ls-aspartate ammonia-lyase (oxaloacetate-forming)" . "erythro-3-hydroxy-Ls-aspartate ammonia-lyase activity" . "erythro-3-hydroxy-Ls-aspartate hydro-lyase (deaminating)" . "erythro-3-hydroxyaspartate dehydratase activity" . "erythro-beta-hydroxyaspartate dehydratase activity" . .