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TitleStructure and mechanism of the PilF DNA transformation ATPase from Thermus thermophilus.
Journal, issue, pagesBiochem J, Vol. 450, Issue 2, Page 417-425, Year 2013
Publish dateMar 1, 2013
AuthorsRichard F Collins / Darin Hassan / Vijaykumar Karuppiah / Angela Thistlethwaite / Jeremy P Derrick /
PubMed AbstractMany Gram-negative bacteria contain specific systems for uptake of foreign DNA, which play a critical role in the acquisition of antibiotic resistance. The TtPilF (PilF ATPase from Thermus ...Many Gram-negative bacteria contain specific systems for uptake of foreign DNA, which play a critical role in the acquisition of antibiotic resistance. The TtPilF (PilF ATPase from Thermus thermophilus) is required for high transformation efficiency, but its mechanism of action is unknown. In the present study, we show that TtPilF is able to bind to both DNA and RNA. The structure of TtPilF was determined by cryoelectron microscopy in the presence and absence of the ATP analogue p[NH]ppA (adenosine 5'-[β,γ-imido]triphosphate), at 10 and 12 Å (1 Å=0.1 nm) resolutions respectively. It consists of two distinct N- and C-terminal regions, separated by a short stem-like structure. Binding of p[NH]ppA induces structural changes in the C-terminal domains, which are transmitted via the stem to the N-terminal domains. Molecular models were generated for the apoenzyme and p[NH]ppA-bound states in the C-terminal regions by docking of a model based on a crystal structure from a closely related enzyme. Analysis of DNA binding by electron microscopy, using gold labelling, localized the binding site to the N-terminal domains. The results suggest a model in which DNA uptake by TtPilF is powered by ATP hydrolysis, causing conformational changes in the C-terminal domains, which are transmitted via the stem to take up DNA into the cell.
External linksBiochem J / PubMed:23252471 / PubMed Central
MethodsEM (single particle)
Resolution10.0 - 12.0 Å
Structure data

EMDB-2222:
Structure of the PilF DNA transformation ATPase (AMPPNP bound form)
Method: EM (single particle) / Resolution: 12.0 Å

EMDB-2223:
Structure of the PilF DNA transformation ATPase (AMPPNP bound form)
Method: EM (single particle) / Resolution: 10.0 Å

Source
  • Thermus thermophilus (bacteria)

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