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Structure and function of MuvB complexes.

Gerd A Müller1, Anushweta Asthana2, Seth M Rubin3

  • 1Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA, 95064, USA. gemuelle@ucsc.edu.

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Summary
This summary is machine-generated.

MuvB complexes regulate cell division by repressing or activating gene transcription. Recent structural and interaction studies reveal how MuvB controls cell-cycle progression and its role in cancer.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Biology

Background:

  • Cell-division cycle progression is crucial for development and homeostasis, with misregulation implicated in cancer.
  • Control of gene transcription during DNA replication (S phase) and mitosis (M phase) is key to cell-cycle regulation.
  • MuvB complexes are central regulators of these critical cell-division genes.

Purpose of the Study:

  • To review recent discoveries on MuvB complex structure and molecular interactions.
  • To elucidate the mechanisms by which MuvB complexes inhibit and stimulate gene expression.
  • To present the first mechanistic models for MuvB biochemical function.

Main Methods:

  • Review of recent structural biology studies of MuvB complexes.
  • Analysis of MuvB interactions with nucleosomes and chromatin-binding proteins.
  • Integration of findings into mechanistic models of MuvB function.

Main Results:

  • MuvB complexes function as repressors (DREAM complex) of G1/S and G2/M genes in non-dividing cells.
  • MuvB also forms activator complexes with B-MYB and FOXM1, essential for G2/M gene expression.
  • New structural and interaction data provide mechanistic insights into MuvB's dual role.

Conclusions:

  • Understanding MuvB's structure and interactions is key to deciphering its role in cell-cycle control.
  • MuvB's dual function as repressor and activator highlights its critical role in cell division.
  • These findings advance our understanding of cell-cycle regulation and cancer biology.