Related Experiment Video
Updated: May 7, 2026
10:36
Measurements of Physiological Stress Responses in C. Elegans
Published on: May 21, 2020
14.0K
Initiating cellular stress responses
Christopher J Bakkenist1, Michael B Kastan
1Department of Hematology-Oncology, St. Jude Children's Research Hospital, 332 N. Lauderdale Street, Memphis, TN 38105, USA.
Cell
|July 10, 2004
Summary
Phosphoinositide 3-kinase related kinases (PIKKs) manage cellular responses to DNA damage and nutrient stress. Precise control of PIKKs, through complex formation and substrate access, is vital for cell survival under stress.
Area of Science:
- Molecular Biology
- Cellular Stress Response
- Kinase Signaling
Background:
- Phosphoinositide 3-kinase related kinases (PIKKs) are crucial regulators of cellular responses to various stresses.
- These stresses include DNA double-strand breaks (DSBs), replication fork abnormalities, mRNA premature termination codons, and nutrient deprivation.
- Proper regulation of PIKKs is essential for minimizing cellular damage and ensuring cell viability.
Purpose of the Study:
- To elucidate the regulatory mechanisms governing PIKK activity under stress conditions.
- To understand how PIKKs are controlled to maintain cellular homeostasis.
- To investigate the role of protein complex formation in PIKK regulation.
Main Methods:
- Investigating the localization of PIKKs within multiprotein complexes at damage sites.
- Analyzing protein-protein interactions that facilitate substrate access to PIKK catalytic domains.
- Utilizing biochemical and cell-based assays to study PIKK regulation.
Main Results:
- PIKKs are recruited to sites of cellular damage, forming multiprotein complexes.
- Specific protein-protein interactions mediate substrate accessibility to PIKK catalytic domains.
- These regulatory mechanisms ensure precise PIKK activity in response to diverse cellular stresses.
Conclusions:
- The localization and protein interactions of PIKKs are key control mechanisms.
- These mechanisms are critical for limiting cellular damage and promoting cell survival during stress.
- Understanding PIKK regulation provides insights into cellular stress response pathways.
Related Concept Videos
02:38Mitogens and the Cell Cycle
6.4K
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
6.4K
01:31Regulation of the Unfolded Protein Response
2.2K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.2K
01:24Physiological Foundation of Stress
1.1K
Stress triggers a coordinated physiological response involving the sympathetic nervous system (SNS) and the hypothalamic-pituitary-adrenal (HPA) axis. This dual activation ensures that the body is prepared for both immediate and prolonged stress management. The process begins with the perception of a stressor. This initial phase activates the SNS, leading to the rapid release of adrenaline (epinephrine) from the adrenal glands.
Role of the Sympathetic Nervous System
Adrenaline triggers the...
Role of the Sympathetic Nervous System
Adrenaline triggers the...
1.1K
01:30Other Stress Responses in Bacteria
593
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
593
01:00Cellular Injury I: Introduction
95
Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
95
01:22Cellular Injury V: Apoptosis and Autophagy
121
Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
121