1vlx

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spinqualitylabelsall models 1vlx, resolution 1.9Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

STRUCTURE OF ELECTRON TRANSFER (COBALT-PROTEIN)

Overview

The crystal structure of cobalt-substituted azurin from Pseudomonas, aeruginosa has been determined to final crystallographic R value of 0.175, at 1.9 A resolution. There are four molecules in the asymmetric unit in, the structure, and these four molecules are packed as a dimer of dimers., The dimer packing is very similar to that of the wild-type Pseudomonas, aeruginosa azurin dimer. Replacement of the native copper by the cobalt, ion has only small effects on the metal binding site presumably because of, the existence of an extensive network of hydrogen bonds in its immediate, neighborhood. Some differences are obvious, however. In wild-type azurin, the copper atom occupies a distorted trigonal bipyramidal site, while, cobalt similar to zinc and nickel occupy a distorted tetrahedral site, in, which the distance to the Met121,S(delta) atom is increased to 3.3-3.5 A, and the distance to the carbonyl oxygen of Gly45 has decreased to 2.1-2.4, A. The X-band EPR spectrum of the high-spin Co(II) in azurin is well, resolved (apparent g values gx' = 5.23; gy' = 3.83; gz' = 1.995, and, hyperfine splittings Ax' = 31; Ay' = 20-30; Az' = 53 G) and indicates that, the ligand field is close to axial.

About this Structure

1VLX is a Single protein structure of sequence from Pseudomonas aeruginosa with CO as ligand. Full crystallographic information is available from OCA.

Reference

The metal site of Pseudomonas aeruginosa azurin, revealed by a crystal structure determination of the Co(II) derivative and Co-EPR spectroscopy., Bonander N, Vanngard T, Tsai LC, Langer V, Nar H, Sjolin L, Proteins. 1997 Mar;27(3):385-94. PMID:9094740

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