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Specific binding of Alu sequences by HeLa nuclear extracts.
Biochemical and Biophysical Research Communications
|December 16, 1983
Summary
Researchers found specific binding proteins in HeLa nuclear extracts that target the human Alu sequence. This suggests a selective interaction with this repetitive DNA element.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- The human Alu sequence is a highly abundant repetitive element in the genome.
- Understanding the interactions of nuclear proteins with specific DNA sequences is crucial for gene regulation.
Purpose of the Study:
- To identify if HeLa nuclear extracts contain factors that specifically bind to the human Alu consensus sequence.
Main Methods:
- DNA fragments, including the 300bp human Alu consensus sequence and pBR322 plasmid fragments, were generated using restriction enzymes.
- Fragments were end-labeled with 32P-gamma-ATP.
- Labeled fragments were incubated with HeLa nuclear extracts and filtered through nitrocellulose to assess DNA-protein binding.
Main Results:
- The 300bp human Alu consensus sequence was preferentially retained on the nitrocellulose filter.
- No preferential binding was observed for fragments derived from pBR322.
- Histones, known for non-specific DNA binding, did not preferentially bind the Alu sequence.
Conclusions:
- HeLa nuclear extracts contain specific components that bind to the human Alu consensus sequence.
- This binding is sequence-specific and not due to non-specific DNA-binding proteins.