A stimulatory RNA associated with RecBCD enzyme.

Abstract:

:RecBCD enzyme acts in the major pathway of homologous recombination of linear DNA in Escherichia coli. The enzyme unwinds DNA and is an ATP-dependent double-strand and single-strand exonuclease and a single-strand endonuclease; it acts at Chi recombination hotspots (5'-GCTGGTGG-3') to produce a recombinogenic single-stranded DNA 3'-end. We found that a small RNA with a unique sequence of approximately 24 nt was tightly bound to RecBCD enzyme and co-purified with it. When added to native enzyme this RNA, but not four others, increased DNA unwinding and Chi nicking activities of the enzyme. In seven similarly active enzyme preparations the molar ratio of RNA molecules to RecBCD enzyme molecules ranged from 0.2 to <0.008. These results suggest that, although this unique RNA is not an essential enzyme subunit, it has a biological role in stimulating RecBCD enzyme activity.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Amundsen SK,Taylor AF,Smith GR

doi

10.1093/nar/26.9.2125

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

2125-31

issue

9

eissn

0305-1048

issn

1362-4962

pii

gkb352

journal_volume

26

pub_type

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