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Bacterial flagellar capping proteins adopt diverse oligomeric states

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.18857· OSTI ID:1357646
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [6];  [5];  [3];  [7];  [2];  [1]
  1. Univ. of Maryland School of Medicine, Baltimore, MD (United States)
  2. Univ. of Maryland School of Pharmacy, Baltimore, MD (United States)
  3. Univ. of Virginia, Charlottesville, VA (United States)
  4. Univ. of Konstanz (Germany)
  5. Technische Univ. Braunschweig (Germany)
  6. The Hebrew Univ. of Jerusalem (Israel)
  7. Univ. of Maryland College Park, Baltimore,MD (United States)
Flagella are crucial for bacterial motility and pathogenesis. The flagellar capping protein (FliD) regulates filament assembly by chaperoning and sorting flagellin (FliC) proteins after they traverse the hollow filament and exit the growing flagellum tip. In the absence of FliD, flagella are not formed, resulting in impaired motility and infectivity. Here, we report the 2.2 Å resolution X-ray crystal structure of FliD from Pseudomonas aeruginosa, the first high-resolution structure of any FliD protein from any bacterium. Using this evidence in combination with a multitude of biophysical and functional analyses, we find that Pseudomonas FliD exhibits unexpected structural similarity to other flagellar proteins at the domain level, adopts a unique hexameric oligomeric state, and depends on flexible determinants for oligomerization. Considering that the flagellin filaments on which FliD oligomers are affixed vary in protofilament number between bacteria, our results suggest that FliD oligomer stoichiometries vary across bacteria to complement their filament assemblies.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Center for Research Resources
OSTI ID:
1357646
Journal Information:
eLife, Journal Name: eLife Journal Issue: 9 Vol. 5; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (7)

Assessment of hard target modeling in CASP12 reveals an emerging role of alignment-based contact prediction methods journal November 2017
Small angle X-ray scattering and cross-linking for data assisted protein structure prediction in CASP 12 with prospects for improved accuracy journal February 2018
Bacterial flagellar axial structure and its construction journal December 2017
A structural model of flagellar filament switching across multiple bacterial species journal October 2017
Accuracy of protein-level disorder predictions journal October 2019
Analysis of a flagellar filament cap mutant reveals that HtrA serine protease degrades unfolded flagellin protein in the periplasm of Borrelia burgdorferi journal April 2019
A protein secreted by the Salmonella type III secretion system controls needle filament assembly journal July 2018

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