Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

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

Macromolecule Content

• Total Structure Weight: 76095.69 
• Atom Count: 5303 
• Residue Count: 679 
• Unique protein chains: 1

4H0W

Bismuth bound human serum transferrin

• DOI: 10.2210/pdb4H0W/pdb

• Classification: METAL TRANSPORT
• Organism(s): Homo sapiens


• Deposited: 2012-09-10 Released: 2012-12-26 
• Deposition Author(s): Yang, N., Zhang, H., Wang, M., Hao, Q., Sun, H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.256 
• R-Value Work: 0.194 

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

• PubMed: 23256035 
• DOI: 10.1038/srep00999
• Primary Citation of Related Structures:  
  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 2.8 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.

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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Serotransferrin	A	679	Homo sapiens	Mutation(s): 0  Gene Names: TF
Find proteins for P02787 (Homo sapiens) Go to Gene View: TF Go to UniProtKB:  P02787

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
FE	A	FE (III) ION Fe VTLYFUHAOXGGBS-UHFFFAOYSA-N
BS3	A	Bismuth(III) ION Bi JCXGWMGPZLAOME-UHFFFAOYSA-N
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
CO3	A	CARBONATE ION C O3 BVKZGUZCCUSVTD-UHFFFAOYSA-L
NTA	A	NITRILOTRIACETIC ACID C6 H9 N O6 MGFYIUFZLHCRTH-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.256 
• R-Value Work: 0.194 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 73.907	α = 90.00
b = 90.165	β = 90.00
c = 111.032	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data scaling
Blu-Ice	data collection
PHASER	phasing
HKL-2000	data reduction
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-09-10 
• Released Date: 2012-12-26 
• Deposition Author(s): Yang, N., Zhang, H., Wang, M., Hao, Q., Sun, H.

Revision History 

• Version 1.0: 2012-12-26
  Type: Initial release
• Version 1.1: 2013-01-16
  Type: Database references