1S8C image
Deposition Date 2004-02-02
Release Date 2004-08-03
Last Version Date 2023-08-23
Entry Detail
PDB ID:
1S8C
Keywords:
Title:
Crystal structure of human heme oxygenase in a complex with biliverdine
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.19 Å
R-Value Free:
0.28
R-Value Work:
0.24
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Heme oxygenase 1
Gene (Uniprot):HMOX1
Chain IDs:A, B, C, D
Chain Length:233
Number of Molecules:4
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Crystal Structure of Human Heme Oxygenase-1 in a Complex with Biliverdin
Biochemistry 43 3793 3801 (2004)
PMID: 15049686 DOI: 10.1021/bi035451l

Abstact

Heme oxygenase oxidatively cleaves heme to biliverdin, leading to the release of iron and CO through a process in which the heme participates both as a cofactor and as a substrate. Here we report the crystal structure of the product, iron-free biliverdin, in a complex with human HO-1 at 2.19 A. Structural comparisons of the human biliverdin-HO-1 structure with its heme complex and the recently published rat HO-1 structure in a complex with the biliverdin-iron chelate [Sugishima, M., Sakamoto, H., Higashimoto, Y., Noguchi, M., and Fukuyama, K. (2003) J. Biol. Chem. 278, 32352-32358] show two major differences. First, in the absence of an Fe-His bond and solvent structure in the active site, the distal and proximal helices relax and adopt an "open" conformation which most likely encourages biliverdin release. Second, iron-free biliverdin occupies a different position and orientation relative to heme and the biliverdin-iron complex. Biliverdin adopts a more linear conformation and moves from the heme site to an internal cavity. These structural results provide insight into the rate-limiting step in HO-1 catalysis, which is product, biliverdin, release.

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