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Updated: May 3, 2026

Methods to Identify the NMR Resonances of the 13C-Dimethyl N-terminal Amine on Reductively Methylated Proteins
Published on: December 12, 2013
The nuclear matrix prepared by amine modification
K M Wan1, J A Nickerson, G Krockmalnic
1Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Researchers developed a new method to isolate the nuclear matrix by chemically modifying chromatin, enabling its removal at physiological ionic strength. This technique preserves the nuclear matrix's native structure for better cellular architecture studies.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The cell nucleus is organized by the nuclear matrix, a nonchromatin structure.
- Removing chromatin to study the nuclear matrix is technically challenging.
- Existing methods often involve harsh conditions like high salt concentrations.
Purpose of the Study:
- To develop a gentler method for isolating the nuclear matrix.
- To test the hypothesis that chromatin is retained by charge interactions.
- To compare nuclear matrix preparations obtained by different chromatin removal techniques.
Main Methods:
- Nuclease digestion of chromatin followed by chemical modification of amino groups.
- Isolation of the nuclear matrix at physiological ionic strength.
- Comparison of ultrastructure and composition with traditional high-salt and crosslinking methods.
Main Results:
- Chromatin was effectively removed at physiological ionic strength using the new protocol.
- All three tested methods revealed similar internal nuclear matrix structures.
- A consistent network of branched filaments (approx. 10 nm diameter) was observed.
Conclusions:
- Chemical modification offers an effective and gentler approach to isolate the nuclear matrix.
- The observed filament network likely represents a fundamental architectural element of the native nuclear matrix.
- Findings increase confidence in studying the nuclear matrix's structure in living cells.
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