Ammonia Assimilation

The assimilation ofNH3 obtained from N2 reduction occurs principally via the glutamine synthetase-glutamate synthase (GS-GOGAT) pathway. The first enzyme catalyzes the ATP-dependent assimilation of ammonia into glutamine using glutamate as a substrate:

The second enzyme catalyzes the reductive transfer of the amide group from glutamine to a-ketoglutarate, forming two molecules of glutamate. The reductants are NAD(P)H or reduced ferredoxin (Fdxred):

Glutamine + a-ketoglutarate + NAD(P)H(or Fdxred) ! 2glutamate + NA(D)P+(or Fdxox)

One glutamate serves to keep the pathway going, whereas the other represents the gain in organic nitrogen.

Solar Power

Solar Power

Start Saving On Your Electricity Bills Using The Power of the Sun And Other Natural Resources!

Get My Free Ebook


Post a comment