Kinetic fractionation of stable nitrogen isotopes during amino acid transamination

Details Kinetic fractionation of stable nitrogen isotopes during amino acid transamination Kinetic fractionation of stable nitrogen isotopes during amino acid transamination

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2143m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 10, pp.2143-2146

Mathematics

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Scientific paper

This study evaluates a kinetic isotope effect involving 15 N, during the transamination reactions catalyzed by glutamic oxalacetic transaminase. During the transfer of amino nitrogen from glutamic acid to oxaloacetate to form aspartic acid, 14 NH 2 reacted 1.0083 times faster than 14 NH 2 . In the reverse reaction transferring NH 2 from aspartic acid to -ketoglutarate, 14 NH 2 was incorporated 1.0017 times faster than 15 NH 2 . Knowledge of the magnitude and sign of these isotope effects will be useful in the interpretation of the distribution of 15 N in biological and geochemical systems.

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