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The Cell Cycle Control System01:28

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Synchronization of Caulobacter Crescentus for Investigation of the Bacterial Cell Cycle
08:02

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Published on: April 8, 2015

System-level design of bacterial cell cycle control.

Harley H McAdams1, Lucy Shapiro

  • 1Department of Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305, USA. hmcadams@stanford.edu

FEBS Letters
|September 22, 2009
PubMed
Summary

Caulobacter cell cycle control operates as a state machine driven by master regulator proteins. This bacterial cell cycle regulation is a whole-cell phenomenon involving signaling proteins and proteases for asymmetric division.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Systems Biology

Background:

  • The bacterial cell cycle, particularly in Caulobacter, is increasingly understood as a complex regulatory network.
  • Previous research has identified key proteins involved in cell cycle progression and division.

Purpose of the Study:

  • To present an integrated view of the Caulobacter cell cycle system functioning as a state machine.
  • To highlight the role of temporally-controlled master regulator proteins in driving cell cycle progression.
  • To emphasize the importance of spatial and temporal regulation of signaling proteins and proteases.

Main Methods:

  • This study integrates existing knowledge of Caulobacter cell cycle regulation.
  • It focuses on the network dynamics of master regulator proteins.
  • Analysis involves understanding the spatial deployment of phospho-signaling proteins and proteases.

Main Results:

  • Caulobacter cell cycle progression is driven by oscillating levels of master regulator proteins in a cyclical circuit.
  • Cell cycle regulation is a whole-cell phenomenon, not confined to specific compartments.
  • Phospho-signaling proteins and proteases dynamically localized to the cell wall are crucial for cell cycle progression and asymmetric division.

Conclusions:

  • The Caulobacter cell cycle functions as a state machine governed by a network of master regulators.
  • Asymmetric cell division is critically dependent on a specific phospho-signaling system integrated into the cell cycle circuitry.
  • Understanding this system provides insights into bacterial cell cycle control and differentiation.