Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B2 

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

Macromolecule Content

• Total Structure Weight: 45230.27 
• Atom Count: 2896 
• Residue Count: 390 
• Unique protein chains: 2

1H2K

Factor Inhibiting HIF-1 alpha in complex with HIF-1 alpha fragment peptide

• DOI: 10.2210/pdb1H2K/pdb

• Classification: TRANSCRIPTION ACTIVATOR/INHIBITOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2002-08-12 Released: 2002-11-28 
• Deposition Author(s): Elkins, J.M., Hewitson, K.S., McNeill, L.A., Schlemminger, I., Seibel, J.F., Schofield, C.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.213 
• R-Value Work: 0.178 

Literature

Structure of Factor-Inhibiting Hypoxia-Inducible Factor (Hif) Reveals Mechanism of Oxidative Modification of Hif-1Alpha

Elkins, J.M., Hewitson, K.S., McNeill, L.A., Seibel, J.F., Schlemminger, I., Pugh, C., Ratcliffe, P., Schofield, C.J.

(2003) J.Biol.Chem. 278: 1802-1806

• PubMed: 12446723 
• DOI: 10.1074/jbc.C200644200
• Primary Citation of Related Structures:  
  1H2N, 1H2M, 1H2L
• Also Cited By: 2WA4, 2WA3, 2W0X, 2ILM, 1YCI


• PubMed Abstract: 
  

The activity of the transcription factor hypoxia-inducible factor (HIF) is regulated by oxygen-dependent hydroxylation. Under normoxic conditions, hydroxylation of proline residues triggers destruction of its alpha-subunit while hydroxylation of Asn(803) in the C-terminal transactivation domain of HIF-1 alpha (CAD) prevents its interaction with p300. Here we report crystal structures of the asparagine hydroxylase (factor-inhibiting HIF, FIH) complexed with Fe((II)), 2-oxoglutarate cosubstrate, and CAD fragments, which reveal the structural basis of HIF modification. CAD binding to FIH occurs via an induced fit process at two distinct interaction sites. At the hydroxylation site CAD adopts a loop conformation, contrasting with a helical conformation for the same residues when bound to p300. Asn(803) of CAD is buried and precisely orientated in the active site such that hydroxylation occurs at its beta-carbon. Together with structures with the inhibitors Zn((II)) and N-oxaloylglycine, analysis of the FIH-CAD complexes will assist design of hydroxylase inhibitors with proangiogenic properties. Conserved structural motifs within FIH imply it is one of an extended family of Fe((II)) oxygenases involved in gene regulation.

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Organizational Affiliation: 

Oxford Centre for Molecular Sciences and the Dyson Perrins Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QY, United Kingdom.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
FACTOR INHIBITING HIF1	A	349	Homo sapiens	Mutation(s): 0  Gene Names: HIF1AN (FIH1) EC: 1.14.11.30, 1.14.11.n4
Find proteins for Q9NWT6 (Homo sapiens) Go to Gene View: HIF1AN Go to UniProtKB:  Q9NWT6

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
HYPOXIA-INDUCIBLE FACTOR 1 ALPHA	S	41	Homo sapiens	Mutation(s): 0  Gene Names: HIF1A (BHLHE78, MOP1, PASD8)
Find proteins for Q16665 (Homo sapiens) Go to Gene View: HIF1A Go to UniProtKB:  Q16665

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
FE2	A	FE (II) ION Fe CWYNVVGOOAEACU-UHFFFAOYSA-N
OGA	A	N-OXALYLGLYCINE C4 H5 N O5 BIMZLRFONYSTPT-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
OGA	Ki: 1200000 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.213 
• R-Value Work: 0.178 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 86.161	α = 90.00
b = 86.161	β = 90.00
c = 146.656	γ = 90.00

Software Package:

Software Name	Purpose
SCALA	data scaling
REFMAC	refinement
SOLVE	phasing
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-08-12 
• Released Date: 2002-11-28 
• Deposition Author(s): Elkins, J.M., Hewitson, K.S., McNeill, L.A., Schlemminger, I., Seibel, J.F., Schofield, C.J.

Revision History 

• Version 1.0: 2002-11-28
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Advisory, Version format compliance
• Version 1.2: 2018-02-21
  Type: Database references