Related Concept Videos
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
02:11The Cell Cycle Control System
The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
02:39Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
02:11The Cell Cycle Control System
The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
01:28The 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.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
01:27Molecular Factors Affecting Cell Division
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
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Related Experiment Video
Updated: Jul 6, 2026
10:54
Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
Published on: September 17, 2012
A dynamically localized protease complex and a polar specificity factor control a cell cycle master regulator.
Patrick T McGrath1, Antonio A Iniesta, Kathleen R Ryan
1Department of Physics, Stanford University, Stanford, CA 94305, USA.
Cell
|February 14, 2006
Summary
Bacterial cell cycle relies on regulated proteolysis. In Caulobacter, the ClpXP protease and RcdA protein complex target the CtrA regulator for degradation at the cell pole, ensuring proper cell cycle progression.
Area of Science:
- Microbiology
- Molecular Biology
- Cell Biology
Background:
- Regulated proteolysis is crucial for cell cycle progression in all organisms.
- The ClpXP protease degrades numerous bacterial proteins.
- Precise spatiotemporal control of protein degradation is vital for bacterial cell cycle regulation.
Purpose of the Study:
- To investigate the dynamic localization and function of the ClpXP protease in Caulobacter.
- To elucidate the mechanism by which the cell cycle master regulator CtrA is degraded.
- To identify factors involved in the spatial regulation of proteolysis during the bacterial cell cycle.
Main Methods:
- Cellular localization studies of ClpXP protease and RcdA protein.
- Analysis of CtrA protein degradation in Caulobacter mutants.
- Protein complex formation assays involving CtrA, RcdA, and ClpX.
Main Results:
- ClpXP protease exhibits dynamic localization to specific cellular positions in Caulobacter.
- CtrA, a key cell cycle regulator, is degraded by ClpXP at the cell pole.
- A novel protein, RcdA, forms a complex with CtrA and ClpX, mediating CtrA's polar localization and degradation.
- RcdA localization is dependent on ClpX localization.
Conclusions:
- A dynamically localized ClpXP proteolysis complex, along with RcdA, provides temporal and spatial specificity for CtrA degradation.
- This mechanism ensures timely clearance of CtrA, enabling initiation of chromosome replication in Caulobacter.
- The findings reveal a novel regulatory pathway for bacterial cell cycle control through targeted protein degradation.