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Journal Article
Research Support, Non-U.S. Gov't
Nonradioactive Isotopic Labeling and Tracing of Selenoproteins in Cultured Cell Lines.
Selenium (Se) is an essential component of genetically encoded selenoproteins, in the form of a rare amino acid, namely the selenocysteine (Sec). Radioactive 75 Se 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 75 Se, for the labeling and tracing of selenoproteins in cultured cell lines.
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