2e3b

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spinqualitylabelsall models 2e3b, resolution 1.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Crystal structure of the HA-bound form of Arthromyces ramosus peroxidase at 1.3 Angstroms resolution

Overview

1.3 A resolution crystal structures of the cyanide, nitric oxide and, hydroxylamine complexes of Arthromyces ramosus peroxidase (ARP), a class, II peroxidase belonging to the plant peroxidase superfamily, have been, determined. Anisotropic temperature factors were introduced for all non-H, atoms of these complexes using SHELX-97 and stereochemical constraints, were applied to the protein, protoporphyrin and sugar moieties, but not to, the coordination geometries to the haem iron. These refinements identified, multiple conformations for several side chains and revised the side-chain, conformations of several residues. Little difference was observed in the, structures of the polypeptides, haem and sugar moieties and in the, coordinations to two calcium ions in these complexes. Characteristic, coordination geometries of each ligand to the haem iron were observed., CN(-) binds to the haem iron in a tilt mode (Fe...C-N = 170 degrees ), whereas NO and hydroxylamine bind in bent modes (Fe...N-O = 125 degrees, and Fe...NH(2)-OH = 111 degrees ). CN(-) is directed toward the distal, histidine (His56) and forms a hydrogen bond with the N(epsilon) atom, whereas NO and hydroxylamine are directed away from His56. The Fe atoms of, ARP-CN and ARP-NO, in which the haem irons are both in low-spin states, are approximately in the pyrrole N plane, whereas the iron in native ARP, which is in a five-coordinated high-spin state, deviates markedly from the, plane.

About this Structure

2E3B is a Single protein structure of sequence from Eukaryota with MAN, CA, HEM and HOA as ligands. Active as Peroxidase, with EC number 1.11.1.7 Full crystallographic information is available from OCA.

Reference

Structures of cyanide, nitric oxide and hydroxylamine complexes of Arthromyces ramosusperoxidase at 100 K refined to 1.3 A resolution: coordination geometries of the ligands to the haem iron., Fukuyama K, Okada T, Acta Crystallogr D Biol Crystallogr. 2007 Apr;63(Pt 4):472-7. Epub 2007, Mar 16. PMID:17372351

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