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Secondary conformational polymorphism of nucleic acids as a possible functional link between cellular parameters and
Z Reich1, R Ghirlando, A Minsky
1Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, Israel.
Biochemistry
|August 6, 1991
Summary
Environmental factors like ionic strength and pH influence DNA condensation. These factors induce structural changes in DNA, regulating its packaging and organization within cells.
Area of Science:
- Molecular Biology
- Biophysics
Background:
- DNA packaging is crucial for cellular function.
- Environmental factors influence DNA structure and organization.
Purpose of the Study:
- To investigate how environmental factors modulate DNA condensation.
- To understand the role of DNA secondary structure in packaging.
Main Methods:
- Circular dichroism spectroscopy
- Electron microscopy
- In vitro DNA packaging systems
Main Results:
- Ionic strength, dehydrating agents, polyamines, and pH affect DNA condensation.
- Alterations in DNA conformation, including non-B-DNA segments, facilitate packaging.
- Environmental parameters regulate the extent and mode of DNA packaging.
Conclusions:
- DNA secondary structural polymorphism plays a regulatory role in packaging.
- Cellular parameters are linked to DNA packaging through structural changes.
- DNA-binding proteins modulate the cellular environment for DNA packaging.