Back to Search
Start Over
Ca
- Source :
- Mol Cell
- Publication Year :
- 2018
-
Abstract
- Abnormal processing of stressed replication forks by nucleases can cause fork collapse, genomic instability, and cell death. Despite its importance, it is poorly understood how the cell properly controls nucleases to prevent detrimental fork processing. Here, we report a signaling pathway that controls the activity of exonuclease Exo1 to prevent aberrant fork resection during replication stress. Our results indicate that replication stress elevates intracellular Ca2+ concentration ([Ca2+]i), leading to activation of CaMKK2 and the downstream kinase 5' AMP-activated protein kinase (AMPK). Following activation, AMPK directly phosphorylates Exo1 at serine 746 to promote 14-3-3 binding and inhibit Exo1 recruitment to stressed replication forks, thereby avoiding unscheduled fork resection. Disruption of this signaling pathway results in excessive ssDNA, chromosomal instability, and hypersensitivity to replication stress inducers. These findings reveal a link between [Ca2+]i and the replication stress response as well as a function of the Ca2+-CaMKK2-AMPK signaling axis in safeguarding fork structure to maintain genome stability.
- Subjects :
- Genome instability
DNA Replication
Programmed cell death
DNA Repair
DNA, Single-Stranded
Calcium-Calmodulin-Dependent Protein Kinase Kinase
Biology
AMP-Activated Protein Kinases
Article
03 medical and health sciences
Mice
0302 clinical medicine
Cell Line, Tumor
Animals
Humans
Protein phosphorylation
Calcium Signaling
Phosphorylation
Protein kinase A
Molecular Biology
030304 developmental biology
CAMKK2
0303 health sciences
Osteoblasts
AMPK
Cell Biology
Fibroblasts
Chromatin
Recombinant Proteins
Cell biology
Isoenzymes
DNA Repair Enzymes
Exodeoxyribonucleases
HEK293 Cells
14-3-3 Proteins
Checkpoint Kinase 1
Calcium
Signal transduction
030217 neurology & neurosurgery
DNA Damage
HeLa Cells
Subjects
Details
- ISSN :
- 10974164
- Volume :
- 74
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Molecular cell
- Accession number :
- edsair.doi.dedup.....877b0cba218fdaa38ea8d3af56a344c2