A comprehensive assessment of selective amino acid 15N-labeling in human embryonic kidney 293 cells for NMR spectroscopy.
J Biomol NMR
; 78(2): 125-132, 2024 Jun.
Article
em En
| MEDLINE
| ID: mdl-38407675
ABSTRACT
A large proportion of human proteins contain post-translational modifications that cannot be synthesized by prokaryotes. Thus, mammalian expression systems are often employed to characterize structure/function relationships using NMR spectroscopy. Here we define the selective isotope labeling of secreted, post-translationally modified proteins using human embryonic kidney (HEK)293 cells. We determined that alpha-[15N]- atoms from 10 amino acids experience minimal metabolic scrambling (C, F, H, K, M, N, R, T, W, Y). Two more interconvert to each other (G, S). Six others experience significant scrambling (A, D, E, I, L, V). We also demonstrate that tuning culture conditions suppressed V and I scrambling. These results define expectations for 15N-labeling in HEK293 cells.
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MEDLINE
Assunto principal:
Ressonância Magnética Nuclear Biomolecular
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Aminoácidos
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Marcação por Isótopo
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Isótopos de Nitrogênio
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article