Nonradioactive Isotopic Labeling and Tracing of Selenoproteins in Cultured Cell Lines.
Methods Mol Biol
; 1661: 193-203, 2018.
Article
in En
| MEDLINE
| ID: mdl-28917046
ABSTRACT
Selenium (Se) is an essential component of genetically encoded selenoproteins, in the form of a rare amino acid, namely the selenocysteine (Sec). Radioactive 75Se has been widely used to trace selenoproteins in vitro and in vivo (cell models and animals). Alternatively, its unique isotopic pattern can be used to detect and characterize nonradioactive Se-compounds in cellular extracts using molecular or elemental mass spectrometry at ppm levels. However, when studying trace levels of Se-compounds, such as selenoproteins (ppt levels), the distribution of the signal between its six naturally abundant isotopes reduces its sensitivity. Here, we describe the use of isotopically enriched forms of Se as an alternative strategy to radioactive 75Se, for the labeling and tracing of selenoproteins in cultured cell lines.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Proteomics
/
Selenoproteins
/
Isotope Labeling
/
Isotopes
Language:
En
Journal:
Methods Mol Biol
Year:
2018
Type:
Article
Affiliation country:
France