Sequence-directed DNA Export Guides Chromosome Translocation During Sporulation in Bacillus Subtilis

Overview

Journal Nat Struct Mol Biol

Specialties Cell Biology
Molecular Biology

Date 2008 Apr 9

PMID 18391964

Citations 56

Authors

Jerod L Ptacin

Marcelo Nollmann

Eric C Becker

Nicholas R Cozzarelli

Kit Pogliano

Carlos Bustamante

Affiliations

Soon will be listed here.

Abstract

In prokaryotes, the transfer of DNA between cellular compartments is essential for the segregation and exchange of genetic material. SpoIIIE and FtsK are AAA+ ATPases responsible for intercompartmental chromosome translocation in bacteria. Despite functional and sequence similarities, these motors were proposed to use drastically different mechanisms: SpoIIIE was suggested to be a unidirectional DNA transporter that exports DNA from the compartment in which it assembles, whereas FtsK was shown to establish translocation directionality by interacting with highly skewed chromosomal sequences. Here we use a combination of single-molecule, bioinformatics and in vivo fluorescence methodologies to study the properties of DNA translocation by SpoIIIE in vitro and in vivo. These data allow us to propose a sequence-directed DNA exporter model that reconciles previously proposed models for SpoIIIE and FtsK, constituting a unified model for directional DNA transport by the SpoIIIE/FtsK family of AAA+ ring ATPases.

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