DOI: 10.1073/pnas.242523299. Single pilus motor forces exceed 100 pN

10.1073/pnas.242523299

Crossref journal-article

Proceedings of the National Academy of Sciences

Proceedings of the National Academy of Sciences (341)

Abstract

Force production by type IV pilus retraction is critical for infectivity of Neisseria gonorrhoeae and DNA transfer. We investigated the roles of pilus number and the retraction motor, PilT, in force generation in vivo at the single-molecule level and found that individual retraction events are generated by a single pilus fiber, and only one PilT complex powers retraction. Retraction velocity is constant at low forces but decreases at forces greater than 40 pN, giving a remarkably high average stall force of 110 ± 30 pN. Further insights into the molecular mechanism of force generation are gained from the effect of ATP-depletion, which reduces the rate of retraction but not the stall force. Energetic considerations suggest that more than one ATP is involved in the removal of a single pilin subunit from a pilus. The results are most consistent with a model in which the ATPase PilT forms an oligomer that disassembles the pilus by a cooperative conformational change.

Bibliography

Maier, B., Potter, L., So, M., Seifert, H. S., & Sheetz, M. P. (2002). Single pilus motor forces exceed 100 pN. Proceedings of the National Academy of Sciences, 99(25), 16012â16017.

Authors 5

Berenike Maier (first)
Laura Potter (additional)
Magdalene So (additional)
Hank S. Seifert (additional)
Michael P. Sheetz (additional)

References 27 Referenced 350

Dates

Type	When
Created	22 years, 8 months ago (Dec. 10, 2002, 12:42 p.m.)
Deposited	3 years, 4 months ago (April 13, 2022, 9:18 a.m.)
Indexed	2 days, 19 hours ago (Sept. 3, 2025, 5:51 a.m.)
Issued	22 years, 9 months ago (Nov. 22, 2002)
Published	22 years, 9 months ago (Nov. 22, 2002)
Published Online	22 years, 9 months ago (Nov. 22, 2002)
Published Print	22 years, 8 months ago (Dec. 10, 2002)

Funders 0

None

BibTeX

@article{Maier_2002, title={Single pilus motor forces exceed 100 pN}, volume={99}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.242523299}, DOI={10.1073/pnas.242523299}, number={25}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Maier, Berenike and Potter, Laura and So, Magdalene and Seifert, Hank S. and Sheetz, Michael P.}, year={2002}, month=nov, pages={16012–16017} }

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