Related Experiment Video
Updated: Jul 13, 2026
07:11
Laser Micro-Irradiation to Study DNA Recruitment During S Phase
Published on: April 16, 2021
Who binds wins: Competition for PCNA rings out cell-cycle changes.
Trends in Cell Biology
|August 22, 2007
Summary
Proliferating cell nuclear antigen (PCNA) is crucial for DNA replication and repair. Its activity is regulated by interactions with numerous proteins throughout the cell cycle.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Proliferating cell nuclear antigen (PCNA) is a key protein involved in fundamental cellular processes.
- PCNA's structure facilitates its interaction with DNA and other proteins.
Purpose of the Study:
- To review the role of PCNA in DNA replication and repair.
- To explore PCNA's involvement in cell-cycle control.
- To examine the regulatory mechanisms coordinating PCNA activity.
Main Methods:
- Literature review of existing research on PCNA.
- Analysis of biochemical and structural data related to PCNA.
- Examination of cell-cycle regulatory pathways involving PCNA.
Main Results:
- PCNA forms a trimeric ring structure enabling it to encircle DNA.
- PCNA acts as a scaffold, binding DNA polymerases and other proteins.
- Evidence suggests PCNA's function is modulated by interactions within a protein network.
Conclusions:
- PCNA plays a central role in DNA replication and repair.
- PCNA's activity is tightly regulated by its interactions with various enzymes and regulatory proteins.
- These interactions are crucial for coordinating PCNA's function with the cell cycle.
Related Concept Videos
01:23Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
02:34Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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.
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
02:36DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
02:36DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...