Fiehn BIS103 lecture 13_fall 2010

Fiehn BIS103 lecture 13_fall 2010 - The Nitrogen Cycle...

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1 The Nitrogen Cycle Nitrogen metabolism nitrogen fixation and nitrate assimilation Amino acids Amino acids Galactose Mannose Fructose PDH N 2 and/or NO 3 -
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2 Nitrogen metabolism nitrogen fixation and nitrate assimilation enter over ammonia, NH 3 Nitrogen fixation Nitrogen assimilation +5 +3 -3 0 NADPH 3 NADPH 16 ATP and 8 red. equival. Nitrogen fixation occurs in symbiotic nodules of legume plants white clover
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3 Nitrogenase is located next to the electron transport chain due to this high energy consuming process N=N Nitrogenase is a protein complex containing molybdoferredoxin and azoferredoxin . http://www.science.siu.edu/microbiology/micr425/425Notes/12-NitrFix.html N 2 + 8 protons + 8 electrons + 16 ATP + 16 water b 2 NH 3 + H 2 + 16 ADP + 16 P i Δ G=-33.5 kJ/mol but triple bond in N2 is very stable with a bond energy of +942 kJ/mol (‘inert’) Nitrogenase mechanism 2 e - Mo 6+ Mo 4+ Fe Fe 2 e - 2 H + Mo 4+ Mo 4+ Fe Fe H H N 2 -H 2 Mo 6+ Mo 4+ Fe Fe H H 2e - 2 H + N=N N=N H H Mo 6+ Fe N-N H H H H 2 H + 2 e - 2 H + 2 NH 3
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Fiehn BIS103 lecture 13_fall 2010 - The Nitrogen Cycle...

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