Structure of a helicase–helicase loader complex reveals insights into the mechanism of bacterial primosome assembly

Bin Liu, William K. Eliason and Thomas A. Steitz ()
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Bin Liu: Yale University
William K. Eliason: Yale University
Thomas A. Steitz: Yale University

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract During the assembly of the bacterial loader-dependent primosome, helicase loader proteins bind to the hexameric helicase ring, deliver it onto the oriC DNA and then dissociate from the complex. Here, to provide a better understanding of this key process, we report the crystal structure of the ~570-kDa prepriming complex between the Bacillus subtilis loader protein and the Bacillus stearothermophilus helicase, as well as the helicase-binding domain of primase with a molar ratio of 6:6:3 at 7.5 Å resolution. The overall architecture of the complex exhibits a three-layered ring conformation. Moreover, the structure combined with the proposed model suggests that the shift from the ‘open-ring’ to the ‘open-spiral’ and then the ‘closed-spiral’ state of the helicase ring due to the binding of single-stranded DNA may be the cause of the loader release.

Date: 2013
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DOI: 10.1038/ncomms3495

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