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Related Experiment Videos

Functional proteomic analysis of human nucleolus.

Alexander Scherl1, Yohann Couté, Catherine Déon

  • 1Central Clinical Chemistry Laboratory, Geneva University Hospital, 1211 Geneva 14, Switzerland.

Molecular Biology of the Cell
|November 14, 2002
PubMed
Summary

This study identified 213 nucleolar proteins in HeLa cells, expanding the known nucleolar proteome to ~350 proteins. Findings suggest nucleoli are crucial for gene expression control and linked to transcription-translation coupling.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Proteomics

Background:

  • The nucleolus is recognized as a "plurifunctional" cellular domain.
  • However, the molecular mechanisms governing nucleolar biological processes are not fully understood.

Purpose of the Study:

  • To identify proteins within HeLa cell nucleoli.
  • To elucidate the molecular mechanisms of nucleolar functions.
  • To explore the role of nucleoli in gene expression control.

Main Methods:

  • Proteomic analysis of HeLa cell nucleoli.
  • Bioinformatic analysis for functional assignment.

Main Results:

  • Identified 213 distinct nucleolar proteins, bringing the total known nucleolar proteome to approximately 350 proteins.

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  • Functional classification revealed diverse biological processes within nucleoli.
  • Assigned hypothetical functions to 43 proteins, with 31 implicated in ribosome biogenesis.
  • Provided evidence for nucleoli's central role in gene expression control.

    • Conclusions:

    • Nucleoli are highly plurifunctional organelles.
    • Nucleoli play a significant role in regulating gene expression.
    • This study supports the coupling of transcription and translation in higher eukaryotes.