Nucleic Acids Research, 1987, Vol. 15, No. 20 8501-8509
© 1987
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Sequence features of the replication terminus of the Bacillus subtilis chromosome
Department of Biochemistry, University of Sydney NSW, Australia
Received August 12, 1987. Revised September 25, 1987. Accepted September 25, 1987.
The sequence of 1267 nucleotides spanning the replication terminus, terC, of the Bacillus subtils 1s168 chromosome has been determined. The site of arrest of the clockwise fork, which defines terC, has been localized to a 30-nucleotide portion (approximately) within this sequence. The arrest site occurs 1n an A+T-r1ch region between two open reading frames and very close to one of two imperfect inverted repeats (4748 nucleotides each) which are separated by 59 nucleotides. The closeness of approach of the arrested clockwise fork to the first Imperfect Inverted repeat encountered in this region raises the possibility of a role for the Inverted repeats in the mechanism of fork arrest.
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