title: Enzymatic synthesis of some (15)N-labelled L-amino acids.
abstract: Our group has developed a stereospecific enzymatic method, which is very efficient for the in vitro synthesis of l-[(15)N]serine, l-[(15)N]methionine and l-[(15)N]glutamic acid. These amino acids were prepared from the corresponding alpha -ketoacids in the suitable enzymatic systems. The bacterial NAD-dependent amino acid dehydrogenases alanin dehydrogenase, leucin dehydrogenase and glutamate dehydrogenase were used as catalysts. Glucose dehydrogenase was used for the regeneration of NADH and (15)NH(4)Cl as isotopically labelled material at 99 at.% (15)N. All reactions are inexpensive and easy to perform on a synthetically useful scale (1-10g) giving high yields of l-amino acids. The (15)N isotope content was determined by mass spectrometry.
authors.affiliation: National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania. chiriac_mr@yahoo.co.uk
authors.forename: Maria
authors.initials: M
authors.lastname: Chiriac
authors.forename: Iulia
authors.initials: I
authors.lastname: Lupan
authors.forename: Flavia
authors.initials: F
authors.lastname: Popa
authors.forename: Nicolae
authors.initials: N
authors.lastname: Palibroda
authors.forename: Octavian
authors.initials: O
authors.lastname: Popescu
mesh_terms: D050788:Alanine Dehydrogenase / Q000378:metabolism; D000596:Amino Acids / Q000096:biosynthesis* / Q000737:chemistry*; D055162:Biocatalysis; D004798:Enzymes / Q000378:metabolism*; D042843:Glucose 1-Dehydrogenase / Q000378:metabolism; D005969:Glutamate Dehydrogenase / Q000378:metabolism; D018698:Glutamic Acid / Q000096:biosynthesis / Q000737:chemistry; D007553:Isotope Labeling; D007651:Keto Acids / Q000378:metabolism; D050803:Leucine Dehydrogenase / Q000378:metabolism; D013058:Mass Spectrometry; D008715:Methionine / Q000096:biosynthesis / Q000737:chemistry; D009243:NAD / Q000378:metabolism; D009587:Nitrogen Isotopes / Q000737:chemistry*; D012694:Serine / Q000096:biosynthesis / Q000737:chemistry
chemical_list: D000596:Amino Acids; D004798:Enzymes; D007651:Keto Acids; D009587:Nitrogen Isotopes; D009243:NAD; D018698:Glutamic Acid; D012694:Serine; D008715:Methionine; D042843:Glucose 1-Dehydrogenase; D050788:Alanine Dehydrogenase; D005969:Glutamate Dehydrogenase; D050803:Leucine Dehydrogenase