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Structure paper

TitleStructural cycle of the Thermus thermophilus PilF ATPase: the powering of type IVa pilus assembly.
Journal, issue, pagesSci Rep, Vol. 8, Issue 1, Page 14022, Year 2018
Publish dateSep 19, 2018
AuthorsRichard Collins / Vijaykumar Karuppiah / C Alistair Siebert / Rana Dajani / Angela Thistlethwaite / Jeremy P Derrick /
PubMed AbstractType IV pili are responsible for a diverse range of functions, including twitching motility and cell adhesion. Assembly of the pilus fiber is driven by a cytoplasmic ATPase: it interacts with an ...Type IV pili are responsible for a diverse range of functions, including twitching motility and cell adhesion. Assembly of the pilus fiber is driven by a cytoplasmic ATPase: it interacts with an inner membrane complex of biogenesis proteins which, in turn, bind to nascent pilin subunits and mediate fiber assembly. Here we report the structural characterization of the PilF TFP assembly ATPase from Thermus thermophilus. The crystal structure of a recombinant C-terminal fragment of PilF revealed bound, unhydrolysed ATP, although the full length complex was enzymatically active. 3D reconstructions were carried out by single particle cryoelectron microscopy for full length apoprotein PilF and in complex with AMPPNP. The structure forms an hourglass-like shape, with the ATPase domains in one half and the N1 domains in the second half which, we propose, interact with the other pilus biogenesis components. Molecular models for both forms were generated: binding of AMPPNP causes an upward shift of the N1 domains towards the ATPase domains of ~8 Å. We advocate a model in which ATP hydrolysis is linked to displacement of the N1 domains which is associated with lifting pilin subunits out of the inner membrane, and provide the activation energy needed to form the pilus fiber.
External linksSci Rep / PubMed:30232337 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution2.44 - 8.0 Å
Structure data

3882

6ejf

EMDB-3882, PDB-6ejf:
Thermus thermophilus PilF ATPase (apoprotein form)
Method: EM (single particle) / Resolution: 8.0 Å

4194

6f8l

EMDB-4194, PDB-6f8l:
Thermus thermophilus PilF ATPase (AMPPNP-bound form)
Method: EM (single particle) / Resolution: 8.0 Å

PDB-5oiu:
Crystal structure of PilF type IV pilus assembly ATPase from Thermus thermophilus
Method: X-RAY DIFFRACTION / Resolution: 2.44 Å

Chemicals

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM / Adenosine triphosphate

ChemComp-MG:
Unknown entry

ChemComp-ZN:
Unknown entry

ChemComp-CL:
Unknown entry / Chloride

ChemComp-HOH:
WATER / Water

Source
  • thermus thermophilus hb8 (bacteria)
  • thermus thermophilus (strain hb8 / atcc 27634 / dsm 579) (bacteria)
KeywordsMOTOR PROTEIN / ATPase / AAA+ / type IV pilus / DNA binding protein / ATP / type IV pilus; type II secretion; macromolecular machine

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