1hmd

THE STRUCTURE OF DEOXY AND OXY HEMERYTHRIN AT 2.0 ANGSTROMS RESOLUTION

spinqualitylabelsall models 1hmd, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1hmd is a 4 chain structure with sequence from Themiste dyscritum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: ACE, FEO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HEMT_THEDY Hemerythrin is a respiratory protein in blood cells of certain marine worms. The oxygen-binding site in each chain contains two iron atoms. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The crystallographic structure analyses of deoxy and oxy hemerythrin have been carried out at 2.0 A resolution to extend the low resolution views of the physiological forms of this oxygen-binding protein. Restrained least-squares refinement has produced molecular models giving R-values of 16.8% for deoxy (41,064 reflections from 10 A to 2.0 A) and 17.3% for oxy hemerythrin (40,413 reflections from 10.0 A to 2.0 A). The protein structure in each derivative is very similar to that of myohemerythrin and the various met forms of hemerythrin. The binuclear complex in each derivative retains an oxygen atom bridging the two iron atoms, but the bond lengths found in deoxy hemerythrin support the idea that, in that form, the bridge is protonated, i.e. the bridging group is a hydroxyl. Dioxygen binds to the pentaco-ordinate iron atom in deoxy hemerythrin in the conversion to oxy hemerythrin. The interatomic distances are consistent with the proposed mechanism where the proton from the bridging group is transferred to the bound dioxygen, stabilizing it in the peroxo oxidation state by forming a hydrogen bond between the peroxy group and the bridging oxygen atom. Structures of deoxy and oxy hemerythrin at 2.0 A resolution.,Holmes MA, Le Trong I, Turley S, Sieker LC, Stenkamp RE J Mol Biol. 1991 Apr 5;218(3):583-93. PMID:2016748 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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