Nucleic Acids Research, Vol 24, Issue 10 1865-1872, Copyright © 1996 by Oxford University Press
T Wei and R Bernander
A set of AT-rich repeats is a common motif in prokaryotic replication
origins. We have screened for proteins binding to the AT-rich repeat region
in plasmids F, R1 and pSC101 using an electrophoretic mobility shift assay
with PCR-amplified DNA fragments from the origins. The IciA protein, which
is known to bind to the AT-rich repeat region in the Escherichia coli
origin of chromosome replication, oriC, was found to bind to the
corresponding region from plasmids F (oriS) and R1, but not to pSC101.
DNase I footprint analysis showed that IciA interacted with the AT-rich
region in both F and R1. When the IciA gene was deleted, the copy number of
plasmid F increased somewhat, whereas there was no major effect on the
replication of pSC101 and R1, or on the E. coli chromosome.
ARTICLES
Interaction of the IciA protein with AT-rich regions in plasmid replication origins
Department of Microbiology, Biomedical Center, Uppsala University, Sweden.
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