Studies of the intermediary metabolism in cultured cells of the insect Spodoptera frugiperda using 13C- or 15N-labelled tracers

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• 作者：Petra Adam (1)
  Markus Gütlich (1)
  Hartmut Oschkinat (2)
  Adelbert Bacher (1)
  Wolfgang Eisenreich (1)
  
• 刊名：BMC Biochemistry
• 出版年：2005
• 出版时间：December 2005
• 年：2005
• 卷：6
• 期：1
• 全文大小：1064KB
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• 作者单位：Petra Adam (1)
  Markus Gütlich (1)
  Hartmut Oschkinat (2)
  Adelbert Bacher (1)
  Wolfgang Eisenreich (1)
  
  1. Lehrstuhl für Organische Chemie und Biochemie, Technische Universit?t München, Lichtenbergstr. 4, D-85747, Garching, Germany
  2. Forschungsinstitut für molekulare Pharmakologie, Robert-R?ssle-Str. 10, D-13125, Berlin, Germany
  

文摘

Background Insect cells can serve as host systems for the recombinant expression of eukaryotic proteins. Using this platform, the controlled expression of 15N/13C labelled proteins requires the analysis of incorporation paths and rates of isotope-labelled precursors present in the medium into amino acids. For this purpose, Spodoptera frugiperda cells were grown in a complex medium containing [U-13C6]glucose. In a second experiment, cultures of S. frugiperda were grown in the presence of 15N-phenylalanine. Results Quantitative NMR analysis showed incorporation of the proffered [U-13C6]glucose into the ribose moiety of ribonucleosides (40 -45%) and into the amino acids, alanine (41%), glutamic acid/glutamine (C-4 and C-5, 30%) and aspartate/asparagine (15%). Other amino acids and the purine ring of nucleosides were not formed from exogenous glucose in significant amounts (> 5%). Prior to the incorporation into protein the proffered 15N-phenylalanine lost about 70% of its label by transamination and the labelled compound was not converted into tyrosine to a significant extent. Conclusion Growth of S. frugiperda cells in the presence of [U-13C6]glucose is conducive to the fractional labelling of ribonucleosides, alanine, glutamic acid/glutamine and aspartic acid/asparagine. The isotopolog compositions of the ribonucleosides and of alanine indicate considerable recycling of carbohydrate intermediates in the reductive branch of the pentose phosphate pathway. The incorporation of 15N-labelled amino acids may be hampered by loss of the 15N-label by transamination.