Who guards the guardian? Mechanisms that restrain APC/C during the cell cycle

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• The cell cycle's progression is driven by Cyclin Dependent Kinases (CDKs) and their cyclin coactivators.
• Ordered cell cycle progression and genome maintenance rely on the timed degradation of key proteins, including cyclins.
• The Anaphase Promoting Complex/Cyclosome (APC/C) is a critical E3 ubiquitin ligase responsible for degrading cell cycle regulators.

Purpose of the Study:

• To review the diverse mechanisms that regulate Anaphase Promoting Complex/Cyclosome (APC/C) activity throughout the cell cycle.
• To highlight the conserved role of APC/C in both mitosis and G1 phase maintenance.
• To emphasize the importance of coordinated APC/C regulation in cell growth, proliferation, and disease.

Main Methods:

• Literature review of existing research on APC/C regulation and function.
• Analysis of mechanisms counteracting APC/C activity.
• Synthesis of information regarding APC/C's role in different cell cycle phases.

Main Results:

• APC/C activity oscillates dramatically during the cell cycle, peaking in mitosis and remaining low from G1/S through G1.
• APC/C controls the degradation of cyclins and numerous other substrates, acting as a core component of the cell cycle oscillator.
• APC/C plays vital roles in both mitosis and G1 phase, with its tight regulation essential for preventing aberrant protein accumulation.

Conclusions:

• The coordinated regulation of APC/C activity by various counteracting mechanisms is essential for proper cell cycle progression.
• Dysregulation of APC/C function can lead to uncontrolled cell growth and contribute to the development of diseases.
• Understanding APC/C regulation provides insights into fundamental cell biology and potential therapeutic targets.