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A stimulatory RNA associated with RecBCD enzyme
S K Amundsen1, A F Taylor, G R Smith
1Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, A1-162, PO Box 19024, Seattle, WA 98109, USA.
Nucleic Acids Research
|June 20, 1998
Summary
A unique small RNA molecule was found to bind and enhance the activity of the RecBCD enzyme, a key player in DNA recombination in E. coli. This RNA stimulates DNA unwinding and Chi nicking, suggesting a regulatory role in homologous recombination.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- RecBCD enzyme is central to homologous recombination of linear DNA in Escherichia coli.
- It possesses DNA unwinding, exonuclease, and endonuclease activities, and acts at Chi hotspots.
Purpose of the Study:
- To investigate the association of small molecules with the RecBCD enzyme.
- To determine the functional impact of any associated molecules on RecBCD enzyme activity.
Main Methods:
- Co-purification of RecBCD enzyme with associated nucleic acids.
- Biochemical assays measuring DNA unwinding and Chi nicking activities.
- Testing the effect of purified small RNAs on enzyme function.
Main Results:
- A unique small RNA (approx. 24 nt) was tightly bound and co-purified with RecBCD enzyme.
- Addition of this specific RNA significantly increased DNA unwinding and Chi nicking activities.
- Other tested RNAs did not affect enzyme activity.
Conclusions:
- A unique small RNA molecule acts as a stimulatory factor for RecBCD enzyme.
- This RNA, while not an essential subunit, plays a biological role in enhancing RecBCD's enzymatic functions in DNA recombination.