4PZ5

Crystal structure of the second and third fibronectin F1 modules in complex with a fragment of BBK32 from Borrelia burgdorferi


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Borrelia burgdorferi Protein BBK32 Binds to Soluble Fibronectin via the N-terminal 70-kDa Region, Causing Fibronectin to Undergo Conformational Extension.

Harris, G.Ma, W.Maurer, L.M.Potts, J.R.Mosher, D.F.

(2014) J.Biol.Chem. 289: 22490-22499

  • DOI: 10.1074/jbc.M114.578419

  • PubMed Abstract: 
  • BBK32 is a fibronectin (FN)-binding protein expressed on the cell surface of Borrelia burgdorferi, the causative agent of Lyme disease. There is conflicting information about where and how BBK32 interacts with FN. We have characterized interactions o ...

    BBK32 is a fibronectin (FN)-binding protein expressed on the cell surface of Borrelia burgdorferi, the causative agent of Lyme disease. There is conflicting information about where and how BBK32 interacts with FN. We have characterized interactions of a recombinant 86-mer polypeptide, "Bbk32," comprising the unstructured FN-binding region of BBK32. Competitive enzyme-linked assays utilizing various FN fragments and epitope-mapped anti-FN monoclonal antibodies showed that Bbk32 binding involves both the fibrin-binding and the gelatin-binding domains of the 70-kDa N-terminal region (FN70K). Crystallographic and NMR analyses of smaller Bbk32 peptides complexed, respectively, with (2-3)FNI and (8-9)FNI, demonstrated that binding occurs by β-strand addition. Isothermal titration calorimetry indicated that Bbk32 binds to isolated FN70K more tightly than to intact FN. In a competitive enzyme-linked binding assay, complex formation with Bbk32 enhanced binding of FN with mAbIII-10 to the (10)FNIII module. Thus, Bbk32 binds to multiple FN type 1 modules of the FN70K region by a tandem β-zipper mechanism, and in doing so increases accessibility of FNIII modules that interact with other ligands. The similarity in the FN-binding mechanism of BBK32 and previously studied streptococcal proteins suggests that the binding and associated conformational change of FN play a role in infection.


    Organizational Affiliation

    From the Department of Biology, University of York, York YO10 5DD, United Kingdom and.,the Departments of Biomolecular Chemistry and Medicine, University of Wisconsin, Madison, Wisconsin 53706.,the Departments of Biomolecular Chemistry and Medicine, University of Wisconsin, Madison, Wisconsin 53706 dfmosher@wisc.edu.,From the Department of Biology, University of York, York YO10 5DD, United Kingdom and jennifer.potts@york.ac.uk.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fibronectin
A
90Homo sapiensMutation(s): 0 
Gene Names: FN1 (FN)
Find proteins for P02751 (Homo sapiens)
Go to Gene View: FN1
Go to UniProtKB:  P02751
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fibronectin-binding protein BBK32
B
16Borrelia burgdorferi (strain ATCC 35210 / B31 / CIP 102532 / DSM 4680)Mutation(s): 0 
Gene Names: bbk32
Find proteins for O50835 (Borrelia burgdorferi (strain ATCC 35210 / B31 / CIP 102532 / DSM 4680))
Go to UniProtKB:  O50835
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ACE
Query on ACE
B
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.96 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.161 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 86.580α = 90.00
b = 86.580β = 90.00
c = 63.570γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
REFMACphasing
SCALAdata scaling
MOSFLMdata reduction
PHENIXrefinement
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-02
    Type: Initial release
  • Version 1.1: 2014-07-23
    Type: Database references
  • Version 1.2: 2014-08-27
    Type: Database references
  • Version 1.3: 2019-07-17
    Type: Data collection, Derived calculations, Refinement description