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Nucleic Acids Research, 1989, Vol. 17, No. 23 9947-9956
© 1989

MOLECULAR BIOLOGY

Sequence limits of DNA strands in the arrested replication fork at the Bacillus subtilis chromosome terminus

N.K. Williams and R.G. Wake

Department of Biochemistry, University of Sydney NSW 2006, Australia

Received September 4, 1989. Revised October 30, 1989. Accepted October 30, 1989.

The DNA sequence limits of the leading and lagging strands in the arrested clockwise replication fork at the terminus of the Bacillus subtilis chromosome have been investigated. On the basis of hybridization to synthetic oligonucleotides corresponding to known positions in the terminus region sequence it has been shown that neither the leading nor legging strands, as they approach terC traverse the distal inverted repeat, IRI. But a small fraction of the leading strands pass through the proximal inverted repeat, IRII This is consistent with IRI being the functional inverted repeat in arresting the clockwise fork. But most of the forks appear to atop at least 100 nucleotidss short of IRI, and at various positions extending over a distance of at least 100 nucleotides.


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[Abstract] [Full Text]


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