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Title: The pilus usher controls protein interactions via domain masking and is functional as an oligomer

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.3044· OSTI ID:1215608
 [1];  [2];  [1];  [1];  [2];  [3];  [1]
  1. Stony Brook Univ., Stony Brook, NY (United States)
  2. Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Washington Univ., St. Louis, MO (United States)

The chaperone/usher (CU) pathway is responsible for biogenesis of organelles termed pili or fimbriae in Gram-negative bacteria. Type 1 pili expressed by uropathogenic Escherichia coli are prototypical structures assembled by the CU pathway. Assembly and secretion of pili by the CU pathway requires a dedicated periplasmic chaperone and a multidomain outer membrane protein termed the usher (FimD). We show that the FimD C-terminal domains provide the high-affinity substrate binding site, but that these domains are masked in the resting usher. Domain masking requires the FimD plug domain, which served as a central switch controlling usher activation. In addition, we demonstrate that usher molecules can act in trans for pilus biogenesis, providing conclusive evidence for a functional usher oligomer. These results reveal mechanisms by which molecular machines such as the usher regulate and harness protein-protein interactions, and suggest that ushers may interact in a cooperative manner during pilus assembly in bacteria.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Institute of Health
Grant/Contract Number:
SC00112704
OSTI ID:
1215608
Report Number(s):
BNL-108346-2015-JA; 600301010
Journal Information:
Nature Structural & Molecular Biology, Vol. 22, Issue 7; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (9)

Handover mechanism of the growing pilus by the bacterial outer-membrane usher FimD journal October 2018
UroPathogenic Escherichia coli (UPEC) Infections: Virulence Factors, Bladder Responses, Antibiotic, and Non-antibiotic Antimicrobial Strategies journal August 2017
Nitazoxanide Inhibits Pilus Biogenesis by Interfering with Folding of the Usher Protein in the Outer Membrane journal January 2016
Electrostatic networks control plug stabilization in the PapC usher text January 2020
Electrostatic networks control plug stabilization in the PapC usher journal November 2015
Structural basis for usher activation and intramolecular subunit transfer in P pilus biogenesis in Escherichia coli journal October 2018
A comprehensive guide to pilus biogenesis in Gram-negative bacteria journal May 2017
Electrostatic networks control plug stabilization in the PapC usher text January 2020
Electrostatic networks control plug stabilization in the PapC usher text January 2016

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