Stable isotope dilution-based accurate comparative quantification of nitrogen-containing metabolites in Arabidopsis thaliana T87 cells using in Vivo 15N-isotope enrichment

Stable isotope dilution-based comparative quantification of nitrogen-containing metabolites for highly sensitive and selective metabolomics was developed using liquid chromatography/mass spectrometry (LC/MS) and 15N-isotope enrichment. We produced metabolically stable isotope-labeled Arabidopsis T87...

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Published inBioscience, biotechnology, and biochemistry Vol. 69; no. 7; pp. 1331 - 1340
Main Authors Kim, J.K. (Osaka Univ., Suita (Japan)), Harada, K, Bamba, T, Fukusaki, E, Kobayashi, A
Format Journal Article
LanguageEnglish
Published Tokyo Japan Society for Bioscience, Biotechnology, and Agrochemistry 01.07.2005
Japan Society for Bioscience Biotechnology and Agrochemistry
Oxford University Press
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Summary:Stable isotope dilution-based comparative quantification of nitrogen-containing metabolites for highly sensitive and selective metabolomics was developed using liquid chromatography/mass spectrometry (LC/MS) and 15N-isotope enrichment. We produced metabolically stable isotope-labeled Arabidopsis T87 cells by culturing with 15N-labeled medium. We found that the growth of cells maintained in 15N-labeled medium is very similar to the growth in normal medium, as evidenced by cell morphology, doubling time, and measurement of chlorophyll and carotenoid contents. Complete incorporation of 15N in folate, S-adenosylmethionine (SAM), and S-adenosylhomocysteine (SAH) in T87 cells was accomplished after culturing for 21 d. Accurate comparative quantification of folate, SAM, and SAH was established by means of LC/MS using the isotopomers of the target metabolites as internal standards. The within- and between-run assay coefficients of variation for the folate, SAM, and SAH levels were all less than 8.5%. Stable isotope labeling by nitrogen source in Arabidopsis T87 cell culture provided simple, inexpensive, and accurate amino acid profiling. This interesting new protocol is valuable for the study of dynamic changes in N-com pound pools in cultured cells.
Bibliography:F61
2006001286
ISSN:0916-8451
1347-6947
DOI:10.1271/bbb.69.1331