Related Experiment Videos
Linker histone binding to superhelical DNA: electrophoretic and filter binding studies
M Ivanchenko1, S Zacharieva, J Yaneva
1Department of Biochemistry and Biophysics, Argonne National Laboratory, Center for Mechanistic Biology and Biotechnology, Oregon State University, Corvallis 97331-7305, USA.
Biochimie
|January 30, 1999
Summary
Linker histones prefer supercoiled DNA. Electrophoretic gels confirmed this preference, but filter binding assays did not, revealing limitations of the filter binding technique for superhelical DNA studies.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Linker histones are known to bind preferentially to supercoiled DNA.
- Previous studies utilized techniques like electrophoresis, sedimentation, and filter binding under non-competitive conditions to demonstrate this preference.
Purpose of the Study:
- To further investigate the binding preference of linker histones to supercoiled DNA.
- To compare the efficacy of electrophoretic gels and filter binding assays under competitive conditions.
Main Methods:
- Utilized one- and two-dimensional electrophoretic gels.
- Employed filter binding assays under competitive conditions with all DNA forms present simultaneously.
Main Results:
- Electrophoretic gels clearly demonstrated the preference of linker histones for superhelical DNA molecules.
- Filter binding assays under competitive conditions failed to reveal this preference.
Conclusions:
- Electrophoretic gels are a reliable method for observing linker histone preference for supercoiled DNA.
- Filter binding assays have limitations when studying superhelical DNA molecules under competitive conditions.