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A molecular mousetrap determines polarity of termination of DNA replication in E. coli
Faculty of Science, Medicine and Health - Papers
  • Mark D Mulcair, Australian National University
  • Patrick M Schaeffer, Australian National University
  • Aaron J Oakley, University of Wollongong
  • Hannah F Cross, University of Southampton
  • Cameron Neylon, University of Southampton
  • Thomas M Hill, University of North Dakota
  • Nicholas E Dixon, University of Wollongong
RIS ID
16843
Publication Date
1-1-2006
Publication Details

Mulcair, M. D., Schaeffer, P. M., Oakley, A. J., Cross, H. F., Neylon, C., Hill, T. M. & Dixon, N. E. (2006). A molecular mousetrap determines polarity of termination of DNA replication in E. coli. Cell, 125 (7), 1309-1319.

Abstract
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.
Citation Information
Mark D Mulcair, Patrick M Schaeffer, Aaron J Oakley, Hannah F Cross, et al.. "A molecular mousetrap determines polarity of termination of DNA replication in E. coli" (2006)
Available at: http://works.bepress.com/nick_dixon/20/