4WJG

Structure of T. brucei haptoglobin-hemoglobin receptor binding to human haptoglobin-hemoglobin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.255 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for trypanosomal haem acquisition and susceptibility to the host innate immune system.

Stdkilde, K.Torvund-Jensen, M.Moestrup, S.K.Andersen, C.B.

(2014) Nat Commun 5: 5487-5487

  • DOI: 10.1038/ncomms6487

  • PubMed Abstract: 
  • Sleeping sickness is caused by trypanosome parasites, which infect humans and livestock in Sub-Saharan Africa. Haem is an important growth factor for the parasites and is acquired from the host by receptor-mediated uptake of haptoglobin (Hp)-haemoglo ...

    Sleeping sickness is caused by trypanosome parasites, which infect humans and livestock in Sub-Saharan Africa. Haem is an important growth factor for the parasites and is acquired from the host by receptor-mediated uptake of haptoglobin (Hp)-haemoglobin (Hb) complexes. The parasite Hp-Hb receptor (HpHbR) is also a target for a specialized innate immune defence executed by trypanosome-killing lipoprotein particles containing an Hp-related protein in complex with Hb. Here we report the structure of the multimeric complex between human Hp-Hb and Trypanosoma brucei brucei HpHbR. Two receptors forming kinked three-helical rods with small head regions bind to Hp and the β-subunits of Hb (βHb), with one receptor at each end of the dimeric Hp-Hb complex. The Hb β-subunit haem group directly associates with the receptors, which allows for sensing of haem-containing Hp-Hb. The HpHbR-binding region of Hp is conserved in Hp-related protein, indicating an identical recognition of Hp-Hb and trypanolytic particles by HpHbR in human plasma.


    Organizational Affiliation

    Department of Biomedicine, Aarhus University, Ole Worms Allé 3, DK-8000 Aarhus C, Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit alpha
A, F, K, P, U, Z
141Homo sapiensGene Names: HBA1, HBA2
Find proteins for P69905 (Homo sapiens)
Go to Gene View: HBA1 HBA2
Go to UniProtKB:  P69905
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Hemoglobin subunit beta
B, G, L, Q, V, 1
146Homo sapiensGene Names: HBB
Find proteins for P68871 (Homo sapiens)
Go to Gene View: HBB
Go to UniProtKB:  P68871
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Haptoglobin
C, H, M, R, W, 2
315Homo sapiensGene Names: HP
Find proteins for P00738 (Homo sapiens)
Go to Gene View: HP
Go to UniProtKB:  P00738
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Iron-regulated surface determinant protein H
D, I, N, S, X, 3
146Staphylococcus aureus (strain N315)Gene Names: isdH (harA, sasI)
Find proteins for Q99TD3 (Staphylococcus aureus (strain N315))
Go to UniProtKB:  Q99TD3
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Haptoglobin-hemoglobin receptor
E, J, O, T, Y, 4
343Trypanosoma brucei bruceiGene Names: HpHbR
Find proteins for I7BA80 (Trypanosoma brucei brucei)
Go to UniProtKB:  I7BA80
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OXY
Query on OXY

Download SDF File 
Download CCD File 
1, A, B, F, G, K, L, P, Q, U, V, Z
OXYGEN MOLECULE
O2
MYMOFIZGZYHOMD-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
1, A, B, F, G, K, L, P, Q, U, V, Z
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
2, 4, C, E, H, J, M, O, R, T, W, Y
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.255 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 143.230α = 90.00
b = 140.950β = 98.54
c = 267.180γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
The Lundbeck FoundationDenmark--
The Novo Nordisk FoundationDenmark--
The European Research CouncilDenmark--
The Danish Council for Independent ResearchDenmark--

Revision History 

  • Version 1.0: 2014-11-26
    Type: Initial release
  • Version 1.1: 2014-12-03
    Type: Database references