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Structural principles in cell-cycle control: beyond the CDKs

J A Endicott1, M E Noble

  • 1Laboratory of Molecular Biophysics, Oxford, UK.

Structure (London, England : 1993)
|June 23, 1998
PubMed
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The retinoblastoma protein (Rb) regulates cell cycle progression. Its structure, in complex with viral oncoproteins, reveals atomic mechanisms controlling gene transcription for S phase entry.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Structural Biology

Background:

  • The retinoblastoma protein (Rb) is a key regulator of cell cycle progression.
  • Rb controls the transcription of genes essential for entering the S phase.
  • Understanding Rb's regulatory mechanisms is crucial for cell cycle control research.

Purpose of the Study:

  • To elucidate the atomic mechanisms by which Rb regulates gene transcription.
  • To investigate the structural basis of Rb's interaction with regulatory partners.
  • To identify common structural motifs in cell cycle regulators.

Main Methods:

  • X-ray crystallography was used to determine the structure of Rb.
  • Structural analysis of Rb in complex with a viral oncoprotein peptide.

Related Experiment Videos

  • Comparative structural analysis of cyclins, Rb, and TFIIB.

    • Main Results:

    • The structure of two pocket regions of Rb complexed with a viral oncoprotein peptide was determined.
    • This structure provides insights into the atomic mechanisms of Rb function.
    • A common structural motif was identified in proteins regulating consecutive cell-cycle events, including cyclins, Rb, and TFIIB.

    Conclusions:

    • The structural data reveals key atomic details of Rb's interaction with regulatory peptides.
    • Rb's role in cell cycle control is further clarified by its structural complexes.
    • A conserved motif across different cell cycle regulators suggests a common mechanism for controlling sequential cell-cycle events.