5HU6

Structure of the T. brucei haptoglobin-haemoglobin receptor bound to human haptolgobin-haemoglobin

• PDB DOI: https://doi.org/10.2210/pdb5HU6/pdb
• Entry: 5HU6 supersedes: 4X0I

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens, Trypanosoma brucei brucei
• Expression System: Homo sapiens, Spodoptera frugiperda, Escherichia coli
• Mutation(s): No 


• Deposited: 2016-01-27 Released: 2016-03-02 
• Deposition Author(s): Lane-Serff, H., Higgins, M.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.226 
• R-Value Work: 0.190 
• R-Value Observed: 0.192 

Re-refinement Note

This entry reflects an alternative modeling of the original data in: 4X0I

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 88.83 kDa 
• Atom Count: 6,116 
• Modelled Residue Count: 784 
• Deposited Residue Count: 801 
• Unique protein chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Hemoglobin subunit alpha	A	141	Homo sapiens	Mutation(s): 0  Gene Names: HBA1, HBA2
UniProt & NIH Common Fund Data Resources
Find proteins for P69905 (Homo sapiens) Explore P69905  Go to UniProtKB:  P69905
PHAROS:  P69905 GTEx:  ENSG00000188536 ENSG00000206172

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Hemoglobin subunit beta	B	141	Homo sapiens	Mutation(s): 0  Gene Names: HBB
UniProt & NIH Common Fund Data Resources
Find proteins for P68871 (Homo sapiens) Explore P68871  Go to UniProtKB:  P68871
PHAROS:  P68871 GTEx:  ENSG00000244734

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Haptoglobin	C	259	Homo sapiens	Mutation(s): 0  Gene Names: HP
UniProt & NIH Common Fund Data Resources
Find proteins for P00738 (Homo sapiens) Explore P00738  Go to UniProtKB:  P00738
PHAROS:  P00738 GTEx:  ENSG00000257017

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Haptoglobin-hemoglobin receptor	D	260	Trypanosoma brucei brucei	Mutation(s): 0  Gene Names: HpHbR
UniProt
Find proteins for Q581F2 (Trypanosoma brucei brucei (strain 927/4 GUTat10.1)) Explore Q581F2  Go to UniProtKB:  Q581F2

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	E [auth A], G [auth B]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
NAG	I [auth C], J [auth C]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
OXY	F [auth A], H [auth B]	OXYGEN MOLECULE O2 MYMOFIZGZYHOMD-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.226 
• R-Value Work: 0.190 
• R-Value Observed: 0.192 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 222.29	α = 90
b = 56.56	β = 92.97
c = 66.1	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
iMOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-03-02 
Deposition Author(s): Lane-Serff, H., Higgins, M.K.
• This entry supersedes: 4X0I

Revision History  

• Version 1.0: 2016-03-02
  Type: Initial release
  
• Version 1.1: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary
• Version 1.2: 2024-01-10
  Changes: Data collection, Database references, Refinement description, Structure summary