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Eden, Eran; Geva-Zatorsky, Naama; Issaeva, Irina; Cohen, Ariel; Dekel, Erez; Danon, Tamar; Cohen, Lydia; Mayo, Avi; Alon, Uri
Science (American Association for the Advancement of Science), 02/2011, Letnik: 331, Številka: 6018Journal Article
Cells remove proteins by two processes: degradation and dilution due to cell growth. The balance between these basic processes is poorly understood. We addressed this by developing an accurate and noninvasive method for measuring protein half-lives, called "bleach-chase," that is applicable to fluorescently tagged proteins. Assaying 100 proteins in living human cancer cells showed half-lives that ranged between 45 minutes and 22.5 hours. A variety of stresses that stop cell division showed the same general effect: Long-lived proteins became longer-lived, whereas short-lived proteins remained largely unaffected. This effect is due to the relative strengths of degradation and dilution and suggests a mechanism for differential killing of rapidly growing cells by growth-arresting drugs. This approach opens a way to understand proteome half-life dynamics in living cells.
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