Title

Crystal structure of oxygenated Scapharca dimeric hemoglobin at 1.7-A resolution

UMMS Affiliation

Program in Molecular Medicine; Department of Biochemistry and Molecular Pharmacology

Date

10-14-1994

Document Type

Article

Subjects

Animals; Binding Sites; Bivalvia; Computer Simulation; Crystallography, X-Ray; Heme; Hemoglobins; Ligands; Models, Molecular; Oxyhemoglobins; Protein Conformation; Water

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

The crystal structure of the cooperative dimeric hemoglobin from the blood clam Scapharca inaequivalvis has been determined in the oxygenated state and refined to an R-factor of 0.157 at 1.7-A resolution. The structure is very similar to the carbon monoxide-liganded form with subtle differences in ligand binding geometry. Oxygen binds to the heme iron in a bent conformation with Fe-O-O angles of 135 degrees and 150 degrees for the two subunits. These observed angles are lower than the equivalent angles in the carbon monoxide-liganded form and intermediate between the angles observed in structures of oxygenated sperm whale myoglobin and oxygenated human hemoglobin. This third high resolution structure of Scapharca dimeric hemoglobin permits a detailed analysis of the water structure in the highly hydrated interface between subunits.

Rights and Permissions

Citation: J Biol Chem. 1994 Oct 14;269(41):25259-67.

Related Resources

Link to Article in PubMed

Journal Title

The Journal of biological chemistry

PubMed ID

7929217