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Factors controlling cyclin B expression.

M Ito1

  • 1Department of Biological Sciences, Graduate School of Science, University of Tokyo, Japan.

Plant Molecular Biology
|November 23, 2000
PubMed
Summary
This summary is machine-generated.

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Plant B-type cyclins use a unique MSA element for G2/M phase gene regulation, unlike other eukaryotes. This suggests a plant-specific mechanism involving Myb transcription factors for cell cycle control.

Area of Science:

  • Molecular Biology
  • Plant Science
  • Cell Biology

Background:

  • Cyclins and cyclin-dependent kinases (CDKs) regulate eukaryotic cell cycle transitions.
  • B-type cyclins are typically expressed during the G2/M phase, controlling cell cycle progression.
  • Promoter activation of B-type cyclin genes is cell cycle-regulated across species.

Purpose of the Study:

  • To investigate the molecular mechanisms controlling plant B-type cyclin gene expression.
  • To identify conserved regulatory elements and factors involved in G2/M phase gene activation in plants.
  • To compare plant B-type cyclin gene regulation with mechanisms in yeast and animals.

Main Methods:

  • Analysis of plant B-type cyclin gene promoters.
  • Identification and characterization of cis-acting elements involved in cell cycle regulation.

Related Experiment Videos

  • Comparison of promoter sequences and regulatory mechanisms across different organisms.

    • Main Results:

    • Plant B-type cyclin gene promoters contain a conserved cis-acting element, the MSA element, essential for G2/M phase-specific activation.
    • MSA elements are also found in promoters of other G2/M-specific genes, indicating co-regulation.
    • The MSA element's consensus sequence resembles animal Myb transcription factor binding sites.

    Conclusions:

    • Plants utilize a distinct and simplified mechanism for B-type cyclin gene regulation compared to yeast and animals.
    • The MSA element mediates a plant-specific co-regulation of G2/M phase genes.
    • Plant Myb transcription factors may play a novel role in inducing B-type cyclins and other cell cycle genes during the G2/M phase.