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Electrophoretic heterogeneity of maize histones
M G Ivanchenko1, E I Georgieva
1Institute of Genetics, Laboratory of Molecular Genetics, Bulgarian Academy of Sciences, Sofia.
Electrophoresis
|December 1, 1988
Summary
Researchers developed a fast method to isolate maize histones. Two-dimensional electrophoresis using Triton X-100 effectively separated histone variants and modifications, unlike other methods.
Area of Science:
- Plant molecular biology
- Biochemistry
- Genetics
Background:
- Histones are crucial for DNA packaging in eukaryotes.
- Understanding histone heterogeneity is key to comprehending gene regulation.
- Maize histones require efficient separation techniques for detailed analysis.
Purpose of the Study:
- To establish a rapid histone isolation protocol for maize.
- To evaluate different electrophoretic systems for maize core histone fractionation.
- To identify histone variants and modifications in maize.
Main Methods:
- Fast extraction of histones from maize embryos and seedlings.
- Electrophoresis using acetic acid/urea polyacrylamide gels.
- Electrophoresis using sodium dodecyl sulfate-polyacrylamide gels.
- Two-dimensional electrophoresis utilizing Triton X-100 gels.
- Oxidation of maize core histones to identify oxidation forms.
Main Results:
- High-urea acetic acid/urea gels provided optimal fractionation for core histones, particularly H4.
- Sodium dodecyl sulfate gels were ineffective for separating H2a, H2b, and subfractions of H3 and H4.
- Triton X-100 two-dimensional electrophoresis efficiently separated all histone classes, variants, and modifications.
- Oxidation experiments aimed to characterize Triton X-100 resolved subfractions.
Conclusions:
- A rapid histone isolation method was successfully developed for maize.
- Two-dimensional electrophoresis with Triton X-100 is a powerful tool for maize histone analysis.
- This technique allows for detailed characterization of histone heterogeneity, including variants and modifications.