4H0W

Bismuth bound human serum transferrin

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 

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This is version 1.2 of the entry. See complete history. 


Literature

Iron and bismuth bound human serum transferrin reveals a partially-opened conformation in the N-lobe.

Yang, N., Zhang, H., Wang, M., Hao, Q., Sun, H.

(2012) Sci Rep 2: 999-999

  • DOI: 10.1038/srep00999
  • Primary Citation of Related Structures:  
    4H0W, 3QYT

  • PubMed Abstract: 

    • Human serum transferrin (hTF) binds Fe(III) tightly but reversibly, and delivers it to cells via a receptor-mediated endocytosis process. The metal-binding and release result in significant conformational changes of the protein. Here, we report the crystal structures of diferric-hTF (Fe(N)Fe(C)-hTF) and bismuth-bound hTF (Bi(N)Fe(C)-hTF) at 2 ...

    Human serum transferrin (hTF) binds Fe(III) tightly but reversibly, and delivers it to cells via a receptor-mediated endocytosis process. The metal-binding and release result in significant conformational changes of the protein. Here, we report the crystal structures of diferric-hTF (Fe(N)Fe(C)-hTF) and bismuth-bound hTF (Bi(N)Fe(C)-hTF) at 2.8 and 2.4 Å resolutions respectively. Notably, the N-lobes of both structures exhibit unique "partially-opened" conformations between those of the apo-hTF and holo-hTF. Fe(III) and Bi(III) in the N-lobe coordinate to, besides anions, only two (Tyr95 and Tyr188) and one (Tyr188) tyrosine residues, respectively, in contrast to four residues in the holo-hTF. The C-lobe of both structures are fully closed with iron coordinating to four residues and a carbonate. The structures of hTF observed here represent key conformers captured in the dynamic nature of the transferrin family proteins and provide a structural basis for understanding the mechanism of metal uptake and release in transferrin families.

    Organizational Affiliation: 

    Department of Chemistry, the University of Hong Kong, Pokfulam Road, Hong Kong, PR China.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SerotransferrinA679Homo sapiensMutation(s): 0 
Gene Names: TF, PRO1400
UniProt & NIH Common Fund Data Resources
Find proteins for P02787 (Homo sapiens)
Explore P02787 
Go to UniProtKB:  P02787
PHAROS:  P02787
GTEx:  ENSG00000091513
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG
Download Ideal Coordinates CCD File 
 F [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
BS3
Query on BS3
Download Ideal Coordinates CCD File 
 D [auth A]Bismuth(III) ION
Bi
JCXGWMGPZLAOME-UHFFFAOYSA-N		 Ligand Interaction
NTA (Subject of Investigation/LOI)
Query on NTA
Download Ideal Coordinates CCD File 
 G [auth A]NITRILOTRIACETIC ACID
C6 H9 N O6
MGFYIUFZLHCRTH-UHFFFAOYSA-N		 Ligand Interaction
CO3
Query on CO3
Download Ideal Coordinates CCD File 
 C [auth A], E [auth A]CARBONATE ION
C O3
BVKZGUZCCUSVTD-UHFFFAOYSA-L		 Ligand Interaction
FE
Query on FE
Download Ideal Coordinates CCD File 
 B [auth A]FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.907α = 90
b = 90.165β = 90
c = 111.032γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-26
    Type: Initial release
  • Version 1.1: 2013-01-16
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary