DNA polymerase I and a protein complex bind specifically to E. coli palindromic unit highly repetitive DNA: implications for bacterial chromosome organization.

Abstract:

:Starting from a crude E. coli extract, two activities which specifically protect highly repetitive bacterial DNA sequences (called PU for Palindromic Unit or REP for Repetitive Extragenic Palindromic sequence) against a digestion with Exonuclease III have been purified. We show that one of these activities is due to the DNA polymerase I (Pol I). This constitutes the first indication for a specific interaction between Pol I and a duplex DNA. This interaction requires the presence of PU. It was confirmed and analyzed by native gel electrophoresis and DNase I footprinting experiments. The other activity contained at least five polypeptides. Its binding to PU DNA sequences was confirmed by native gel electrophoresis. Implications for the possible origin and functions of PU are discussed.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Gilson E,Perrin D,Hofnung M

doi

10.1093/nar/18.13.3941

subject

Has Abstract

pub_date

1990-07-11 00:00:00

pages

3941-52

issue

13

eissn

0305-1048

issn

1362-4962

journal_volume

18

pub_type

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