Protein standard absolute quantification (PSAQ) method for the measurement of cellular ubiquitin pools.

Protein standard absolute quantification (PSAQ) method for the measurement of cellular ubiquitin pools.
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DOI:
10.1038/nmeth.1649
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发表时间:
2011-07-10
期刊:
影响因子:
48
通讯作者:
Kopito, Ron R.
Kopito, Ron R.
中科院分区:
生物学1区
文献类型:
--
作者:
Kaiser, Stephen E.;Riley, Brigit E.;Shaler, Thomas A.;Trevino, R. Sean;Becker, Christopher H.;Schulman, Howard;Kopito, Ron R.

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The protein ubiquitin is an important post-translational modifier that regulates a wide variety of biological processes. In cells, ubiquitin is apportioned among distinct pools, which include a variety of free and conjugated species. Although maintenance of a dynamic and complex equilibrium among ubiquitin pools is crucial for cell survival, the tools necessary to quantify each cellular ubiquitin pool have been limited. We have developed a quantitative mass spectrometry approach to measure cellular concentrations of ubiquitin species using isotope-labeled protein standards and applied it to characterize ubiquitin pools in cells and tissues. Our method is convenient, adaptable and should be a valuable tool to facilitate our understanding of this important signaling molecule.
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