6SOZ

Glycosylated Trypanosoma brucei transferrin receptor in complex with human transferrin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.42 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structure of the trypanosome transferrin receptor reveals mechanisms of ligand recognition and immune evasion.

Trevor, C.E.Gonzalez-Munoz, A.L.Macleod, O.J.S.Woodcock, P.G.Rust, S.Vaughan, T.J.Garman, E.F.Minter, R.Carrington, M.Higgins, M.K.

(2019) Nat Microbiol --: --

  • DOI: 10.1038/s41564-019-0589-0
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • To maintain prolonged infection of mammals, African trypanosomes have evolved remarkable surface coats and a system of antigenic variation <sup>1 </sup>. Within these coats are receptors for macromolecular nutrients such as transferrin <sup>2,3 </sup ...

    To maintain prolonged infection of mammals, African trypanosomes have evolved remarkable surface coats and a system of antigenic variation 1 . Within these coats are receptors for macromolecular nutrients such as transferrin 2,3 . These must be accessible to their ligands but must not confer susceptibility to immunoglobulin-mediated attack. Trypanosomes have a wide host range and their receptors must also bind ligands from diverse species. To understand how these requirements are achieved, in the context of transferrin uptake, we determined the structure of a Trypanosoma brucei transferrin receptor in complex with human transferrin, showing how this heterodimeric receptor presents a large asymmetric ligand-binding platform. The trypanosome genome contains a family of around 14 transferrin receptors 4 , which has been proposed to allow binding to transferrin from different mammalian hosts 5,6 . However, we find that a single receptor can bind transferrin from a broad range of mammals, indicating that receptor variation is unlikely to be necessary for promiscuity of host infection. In contrast, polymorphic sites and N-linked glycans are preferentially found in exposed positions on the receptor surface, not contacting transferrin, suggesting that transferrin receptor diversification is driven by a need for antigenic variation in the receptor to prolong survival in a host.


    Organizational Affiliation

    Department of Biochemistry, University of Oxford, Oxford, UK. matthew.higgins@bioch.ox.ac.uk.,Department of Biochemistry, University of Cambridge, Cambridge, UK. mc115@cam.ac.uk.,Department of Biochemistry, University of Cambridge, Cambridge, UK.,Department of Antibody Discovery and Protein Engineering, AstraZeneca R&D, Cambridge, UK.,Department of Biochemistry, University of Oxford, Oxford, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ESAG6, subunit of heterodimeric transferrin receptor
A
399Trypanosoma bruceiMutation(s): 0 
Gene Names: 13J3.10
Find proteins for Q8WPU1 (Trypanosoma brucei)
Go to UniProtKB:  Q8WPU1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ESAG7, subunit of heterodimeric transferrin receptor
B
338Trypanosoma bruceiMutation(s): 0 
Gene Names: 13J3.09
Find proteins for Q8WPU2 (Trypanosoma brucei)
Go to UniProtKB:  Q8WPU2
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Serotransferrin
C
677Homo sapiensMutation(s): 0 
Gene Names: TF
Find proteins for P02787 (Homo sapiens)
Go to Gene View: TF
Go to UniProtKB:  P02787
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

Download SDF File 
Download CCD File 
A
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
FE
Query on FE

Download SDF File 
Download CCD File 
C
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.42 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.211 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 128.180α = 90.00
b = 117.870β = 111.45
c = 134.550γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
XDSdata scaling
BUSTERrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)MR/R001138/1
Biotechnology and Biological Sciences Research Council--
Wellcome Trust--
Engineering and Physical Sciences Research CouncilNS/A000059/1

Revision History 

  • Version 1.0: 2019-11-06
    Type: Initial release