4-phospho-D-erythronate + NAD(+) <=> (R)-3-hydroxy-2-oxo-4-phosphooxybutanoate + NADH + H(+)
4-phospho-d-erythronate + nad(+) <=> (r)-3-hydroxy-2-oxo-4-phosphooxybutanoate + nadh + h(+)
4-phospho-D-erythronate + NAD(+) <=> (R)-3-hydroxy-2-oxo-4-phosphooxybutanoate + NADH + H(+)
4-phospho-d-erythronate + nad(+) <=> (r)-3-hydroxy-2-oxo-4-phosphooxybutanoate + nadh + h(+)