1H2N image
Entry Detail
PDB ID:
1H2N
Keywords:
Title:
Factor Inhibiting HIF-1 alpha
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2002-08-12
Release Date:
2002-11-28
Method Details:
Experimental Method:
Resolution:
2.84 Å
R-Value Free:
0.25
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HYPOXIA-INDUCIBLE FACTOR 1-ALPHA INHIBITOR
Chain IDs:A
Chain Length:349
Number of Molecules:1
Biological Source:HOMO SAPIENS
Primary Citation
Structure of Factor-Inhibiting Hypoxia-Inducible Factor (Hif) Reveals Mechanism of Oxidative Modification of Hif-1Alpha
J.Biol.Chem. 278 1802 1806 (2003)
PMID: 12446723 DOI: 10.1074/JBC.C200644200

Abstact

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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