Related Experiment Videos
The effect of Ni(II) on DNA replication.
1Institute of Environmental Medicine, New York University Medical Center, New York 10016.
Biological Trace Element Research
|July 1, 1989
Summary
Nickel (Ni(II)) initially stimulates but then inhibits DNA replication by interfering with essential metal ion binding sites. This impacts DNA synthesis timing and protein responses during replication and repair.
Area of Science:
- Molecular Biology
- Biochemistry
- Toxicology
Background:
- Cellular DNA replication requires essential metal ions like magnesium (Mg(II)).
- Metal ion availability is crucial for DNA replication fidelity during S-phase and DNA repair.
- Toxic metal ions can disrupt cellular processes by binding to sites normally occupied by essential ions.
Purpose of the Study:
- To investigate the effect of Nickel (Ni(II)) on DNA replication.
- To understand how Ni(II) interferes with DNA synthesis machinery.
- To determine the impact of Ni(II) on replication protein function.
Main Methods:
- Utilized a reconstituted in vitro system for DNA replication studies.
- Employed HeLa cell extract as the source of DNA polymerase activity.
- Used activated calf thymus DNA as a template for replication.
Main Results:
- Nickel (Ni(II)) demonstrated an initial stimulatory effect on DNA precursor incorporation.
- Prolonged exposure to Ni(II) resulted in overall inhibition of DNA synthesis.
- Ni(II) binding to replication proteins appears to alter the temporal regulation of DNA synthesis.
Conclusions:
- Ni(II) may possess multiple binding sites on replication proteins, similar to Mg(II).
- The binding of Ni(II) significantly disrupts the normal progression of DNA synthesis.
- Toxic metal ions like Ni(II) pose a risk to the integrity of DNA replication and repair processes.