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FtsK in motion reveals its mechanism for double-stranded DNA translocation

DOI: 10.1073/pnas.2001324117 DOI Help

Authors: Nicolas L. Jean (Medical Research Council Laboratory of Molecular Biology) , Trevor J. Rutherford (Medical Research Council Laboratory of Molecular Biology) , Jan Lowe (Medical Research Council Laboratory of Molecular Biology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Proceedings Of The National Academy Of Sciences , VOL 6

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 17434

Open Access Open Access

Abstract: FtsK protein contains a fast DNA motor that is involved in bacterial chromosome dimer resolution. During cell division, FtsK translocates double-stranded DNA until both dif recombination sites are placed at mid cell for subsequent dimer resolution. Here, we solved the 3.6-Å resolution electron cryo-microscopy structure of the motor domain of FtsK while translocating on its DNA substrate. Each subunit of the homo-hexameric ring adopts a unique conformation and one of three nucleotide states. Two DNA-binding loops within four subunits form a pair of spiral staircases within the ring, interacting with the two DNA strands. This suggests that simultaneous conformational changes in all ATPase domains at each catalytic step generate movement through a mechanism related to filament treadmilling. While the ring is only rotating around the DNA slowly, it is instead the conformational states that rotate around the ring as the DNA substrate is pushed through.

Journal Keywords: DNA translocation; chromosome segregation; bacterial cell division; cryo-EM

Subject Areas: Biology and Bio-materials

Diamond Offline Facilities: Electron Bio-Imaging Centre (eBIC)
Instruments: Krios II-Titan Krios II at Diamond

Documents:
2001324117.full.pdf