A Molecular Mousetrap Determines Polarity of Termination of DNA Replication in E. coli

Mulcair, M.D., Schaeffer, P.M., Oakley, A.J., Cross, H.F., Neylon, D.C., Hill, T.M. and Dixon, N.E. (2006) A Molecular Mousetrap Determines Polarity of Termination of DNA Replication in E. coli. Cell, 125, (7), 1309-1319. (doi:10.1016/j.cell.2006.04.040).


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During chromosome synthesis in Escherichia coli, replication forks are blocked by Tus bound Ter sites on approach from one direction but not the other. To study the basis of this polarity, we measured the rates of dissociation of Tus from forked TerB oligonucleotides, such as would be produced by the replicative DnaB helicase at both the fork-blocking (nonpermissive) and permissive ends of the Ter site. Strand separation of a few nucleotides at the permissive end was sufficient to force rapid dissociation of Tus to allow fork progression. In contrast, strand separation extending to and including the strictly conserved G-C(6) base pair at the nonpermissive end led to formation of a stable locked complex. Lock formation specifically requires the cytosine residue, C(6). The crystal structure of the locked complex showed that C(6) moves 14 Å from its normal position to bind in a cytosine-specific pocket on the surface of Tus.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.cell.2006.04.040
ISSNs: 0092-8674 (print)
Related URLs:
Subjects: Q Science > QD Chemistry
Q Science > QR Microbiology
Divisions : University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 40707
Accepted Date and Publication Date:
30 June 2006Published
19 December 2005Submitted
Date Deposited: 15 Feb 2007
Last Modified: 31 Mar 2016 12:11
URI: http://eprints.soton.ac.uk/id/eprint/40707

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