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HomeHomework HelpbiologyCyclins and CDKs

Cyclins and CDKs

Cyclins are regulatory proteins whose levels fluctuate throughout the cell cycle, and they activate cyclin-dependent kinases (CDKs), which are enzymes that phosphorylate target proteins to drive the progression of the cell cycle. Together, cyclins and CDKs form a crucial regulatory system that ensures proper cell division and function.

intermediate
2 hours
Biology
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Overview

Cyclins and cyclin-dependent kinases (CDKs) are essential components of the cell cycle, which is the process by which cells grow and divide. Cyclins are proteins that regulate the timing of the cell cycle, while CDKs are enzymes that, when activated by cyclins, phosphorylate target proteins to promo...

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Key Terms

Cyclin
A protein that regulates the cell cycle by activating CDKs.

Example: Cyclin D is important for the transition from G1 to S phase.

CDK
Cyclin-dependent kinase, an enzyme that, when activated, drives the cell cycle.

Example: CDK2 is activated by cyclin E to promote DNA synthesis.

Cell Cycle
The series of phases that a cell goes through to divide and replicate.

Example: The cell cycle includes G1, S, G2, and M phases.

Phosphorylation
The addition of a phosphate group to a protein, often regulating its activity.

Example: CDKs phosphorylate target proteins to initiate cell cycle progression.

Checkpoint
A control mechanism in the cell cycle that ensures proper division.

Example: The G1 checkpoint checks for DNA damage before entering S phase.

Oncogene
A gene that has the potential to cause cancer when mutated.

Example: Mutations in cyclin genes can lead to uncontrolled cell division.

Related Topics

Apoptosis
The process of programmed cell death that eliminates damaged cells.
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Cancer Biology
The study of cancer, its causes, and its treatment.
advanced
Genetic Mutations
Changes in DNA that can lead to cancer and other diseases.
intermediate

Key Concepts

Cell Cycle RegulationProtein InteractionsPhases of Cell CycleCancer Biology