Crystal structure of a putative surface protein encoded by BTA121

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

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Crystal Structure of Borrelia turicatae protein, BTA121, a differentially regulated gene in the tick-mammalian transmission cycle of relapsing fever spirochetes.

Luo, Z.Kelleher, A.J.Darwiche, R.Hudspeth, E.M.Shittu, O.K.Krishnavajhala, A.Schneiter, R.Lopez, J.E.Asojo, O.A.

(2017) Sci Rep 7: 15310-15310

  • DOI: https://doi.org/10.1038/s41598-017-14959-9
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Tick-borne relapsing fever (RF) borreliosis is a neglected disease that is often misdiagnosed. RF species circulating in the United States include Borrelia turicatae, which is transmitted by argasid ticks. Environmental adaptation by RF Borrelia is poorly understood, however our previous studies indicated differential regulation of B. turicatae genes localized on the 150 kb linear megaplasmid during the tick-mammalian transmission cycle, including bta121. This gene is up-regulated by B. turicatae in the tick versus the mammal, and the encoded protein (BTA121) is predicted to be surface localized. The structure of BTA121 was solved by single-wavelength anomalous dispersion (SAD) using selenomethionine-derivative protein. The topology of BTA121 is unique with four helical domains organized into two helical bundles. Due to the sequence similarity of several genes on the megaplasmid, BTA121 can serve as a model for their tertiary  structures. BTA121 has large interconnected tunnels and cavities that can accommodate ligands, notably long parallel helices, which have a large hydrophobic central pocket. Preliminary in-vitro studies suggest that BTA121 binds lipids, notably palmitate with a similar order of binding affinity as tablysin-15, a known palmitate-binding protein. The reported data will guide mechanistic studies to determine the role of BTA121 in the tick-mammalian transmission cycle of B. turicatae.

  • Organizational Affiliation

    Synchrotron Radiation Research Section, Macromolecular Crystallography Laboratory, National Cancer Institute, Argonne, Illinois, 60439, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Uncharacterized protein
A, B
375Borrelia turicatae 91E135Mutation(s): 0 
Gene Names: BTA121
Find proteins for A0A0R9P931 (Borrelia turicatae (strain 91E135))
Explore A0A0R9P931 
Go to UniProtKB:  A0A0R9P931
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0R9P931
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth B],
J [auth B],
K [auth B],
L [auth B],
M [auth B],
N [auth B],
O [auth B]
O4 S
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.055α = 90
b = 102.055β = 90
c = 183.211γ = 120
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-29
    Type: Initial release