5XBJ | pdb_00005xbj

The structure of the flagellar hook junction protein HAP1 (FlgK) from Campylobacter jejuni

• PDB DOI: https://doi.org/10.2210/pdb5XBJ/pdb

• Classification: BIOSYNTHETIC PROTEIN
• Organism(s): Campylobacter jejuni
• Expression System: Escherichia coli-Thermus thermophilus shuttle vector pTRK1T
• Mutation(s): No 


• Deposited: 2017-03-19 Released: 2017-12-06 
• Deposition Author(s): Samatey, F.A.
• Funding Organization(s): Okinawa Institute of Science and Technology Graduate University

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 
  0.232 (Depositor), 0.229 (DCC) 
• R-Value Work: 
  0.178 (Depositor), 0.179 (DCC) 
• R-Value Observed: 
  0.183 (Depositor) 

Starting Model: experimental

Literature

Structure of FlgK reveals the divergence of the bacterial Hook-Filament Junction of Campylobacter

Bulieris, P.V., Shaikh, N.H., Freddolino, P.L., Samatey, F.A.

(2017) Sci Rep 7: 15743-15743

• PubMed: 29147015 
• DOI: https://doi.org/10.1038/s41598-017-15837-0
• Primary Citation Related Structures: 
  5XBJ


• PubMed Abstract: 
  

  Evolution of a nano-machine consisting of multiple parts, each with a specific function, is a complex process. A change in one part should eventually result in changes in other parts, if the overall function is to be conserved. In bacterial flagella, the filament and the hook have distinct functions and their respective proteins, FliC and FlgE, have different three-dimensional structures. The filament functions as a helical propeller and the hook as a flexible universal joint. Two proteins, FlgK and FlgL, assure a smooth connectivity between the hook and the filament. Here we show that, in Campylobacter, the 3D structure of FlgK differs from that of its orthologs in Salmonella and Burkholderia, whose structures have previously been solved. Docking the model of the FlgK junction onto the structure of the Campylobacter hook provides some clues about its divergence. These data suggest how evolutionary pressure to adapt to structural constraints, due to the structure of Campylobacter hook, causes divergence of one element of a supra-molecular complex in order to maintain the function of the entire flagellar assembly.

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Organizational Affiliation: 
• Trans-membrane Trafficking Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Kunigami, Okinawa, 904-0495, Japan.
Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, Michigan, USA.
Trans-membrane Trafficking Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Kunigami, Okinawa, 904-0495, Japan. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 56.98 kDa 
• Atom Count: 4,322 
• Modeled Residue Count: 500 
• Deposited Residue Count: 511 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Flagellar hook-associated protein FlgK	A	511	Campylobacter jejuni	Mutation(s): 0
UniProt
Find proteins for Q0P8E9 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168)) Explore Q0P8E9  Go to UniProtKB:  Q0P8E9

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free:  0.232 (Depositor), 0.229 (DCC) 
• R-Value Work:  0.178 (Depositor), 0.179 (DCC) 
• R-Value Observed: 0.183 (Depositor) 

Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.501	α = 90
b = 123.552	β = 90
c = 92.54	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2017-12-06 
Deposition Author(s): Samatey, F.A.

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Funding Organization	Location	Grant Number
Okinawa Institute of Science and Technology Graduate University	Japan	--

Revision History  

• Version 1.0: 2017-12-06
  Type: Initial release
  
• Version 1.1: 2023-11-22
  Changes: Data collection, Database references, Refinement description