5

(a)    2 NH₄⁺ + 2 ATP + 2 glutamate    2 glutaminę + 2 ADP + 2 Pj

(b)    NADPH + a-ketoglutarate + glutaminę ⁽L 2 glutamate + NADP⁺

SUM: 2 NH₄⁺ + a-ketoglutarate + NADPH + 2 ATP-► glutaminę + NADP⁺ + 2 ADP + 2 Pj

Figurę 25.13 The GS/GOGAT pathway of ammonium assimilation. The sum

of these reactions results in the conversion of 1 a-ketoglutarate to 1 glutaminę at the expense of 2 ATP and 1 NADPH.