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Analysis of Human Natural Killer Cell Metabolism
09:03

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Published on: June 22, 2020

Nucleolar proteome dynamics.

Jens S Andersen1, Yun W Lam, Anthony K L Leung

  • 1Department of Biochemistry and Molecular Biology, Campusvej 55, DK-5230 Odense M, Denmark.

Nature
|January 7, 2005
PubMed
Summary

Researchers quantitatively analyzed the human nucleolus proteome, revealing dynamic protein changes in response to metabolic inhibitors. This study offers a temporal understanding of nucleolar protein flux and its link to cell growth.

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Area of Science:

  • Cell Biology
  • Proteomics
  • Molecular Biology

Background:

  • The nucleolus is a crucial nuclear organelle responsible for ribosome biogenesis.
  • Its functions are linked to cell growth, proliferation, cell-cycle regulation, senescence, and stress responses.

Purpose of the Study:

  • To quantitatively analyze the proteome of human nucleoli.
  • To characterize the temporal flux of nucleolar proteins in response to metabolic stress.

Main Methods:

  • Quantitative organellar proteomics using mass spectrometry and stable isotope labeling.
  • In vivo fluorescent imaging techniques were compared with proteomic data.
  • Analysis of 489 endogenous nucleolar proteins under three metabolic inhibitor conditions.

Main Results:

  • Proteins stably associated with the nucleolus (e.g., RNA polymerase I, snRNP complexes) exhibited similar exit/accumulation kinetics.
  • Components of ribosomal subunits displayed distinct kinetics in their departure from the nucleolus.
  • Significant temporal changes in the nucleolar proteome were observed in response to altered cellular growth conditions.

Conclusions:

  • Established a quantitative proteomic approach for temporal characterization of organellar protein flux.
  • Demonstrated dynamic remodeling of the nucleolar proteome under metabolic stress.
  • Highlighted differential kinetics of protein components within the nucleolus.