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lecture16 - 19-1Nitrogen in our environmentNitrogen in our...

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Unformatted text preview: 19-1Nitrogen in our environmentNitrogen in our environmentHow does nitrogenenter the food chain?Only certain types of bacteria can take219-2Nitrogen FixationNitrogen FixationNitrogen-fixing nodules on the roots of a soybean plant•Bacteria are responsible for the reduction of 24 19-3Nitrogen fixation continuedNitrogen fixation continued•N2reduction is catalyzed by the nitrogenase enzyme complex219-4The Nitrogenase ReactionThe Nitrogenase ReactionIron sulfur containing proteinIron-molybdenumprotein219-5Anabolism of Amino AcidsAnabolism of Amino Acids•Ammoniais toxic at high concentrations•Must be incorporated into compounds such as aminoacids and nucleotides•Glutamateis formed by reductive aminationof α-ketoglutarate•gives rise to all other amino acids by transamination-O- C- CH2- CH2-C-COO-α-Ketoglutarate+NH4+-O- C- CH2- CH2-CH- COO-NH3+GlutamateNADPH + H+NADP+OOO19-6Anabolism of Amino AcidsAnabolism of Amino Acids•amidationof glutamategives glutamineNH4++ATPADP + PiH2N-C- CH2- CH2-CH-COO-NH3+Glutamine-O- C- CH2- CH2- CH- COO-NH3+GlutamateOO19-7Families Based on PrecursorFamilies Based on Precursorα-KetoglutarateGlutamateGlutamineProlineArginineOxaloacetateAspartateAsparagineMethionineThreonineLysineIsoleucine3-PhosphoglycerateSerineCysteineGlycinePyruvateValineAlanineLeucinePhosphoenolpyruvate + Erythrose 4-phosphatePhenylalanineTyrosineTryptophanRibose 5-phosphateHistidineAll amino acids are grouped into families basedon their precursors19-8Amino Acids & TCA CycleAmino Acids & TCA Cycle19-9...
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lecture16 - 19-1Nitrogen in our environmentNitrogen in our...

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