2tsb

AZURIN MUTANT M121A-AZIDE

spinqualitylabelsall models 2tsb, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2tsb is a 4 chain structure with sequence from Pseudomonas aeruginosa. This structure supersedes the now removed PDB entry 1tsb. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AZI, CU Resources: FirstGlance, OCA, RCSB, PDBsum Function [AZUR_PSEAE] Transfers electrons from cytochrome c551 to cytochrome oxidase. 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 crystal structures of the azurin mutant Met121Ala and its azide derivative Met121Ala-azide from Pseudomonas aeruginosa have been determined. The final crystallographic R values are 21.3 and 19.4% for the two structures, respectively. In the Met121Ala mutant, the distance between the copper ion and His117 increases by 0.34 A compared with the wild-type structure. The removal of the methionine in the apical position induces a shortening of the distance from the copper ion to the carbonyl O atom of Gly45 from 2.97 to 2.74 A. In the Met121Ala-azide structure, the azide anion occupies the cavity created by replacing the Met121 side chain with the smaller methyl group of Ala. The azide anion binds with a terminal N atom to the copper ion at a distance of about 2.04 A. In addition, the copper ion has moved out of the trigonal plane by about 0.26 A towards the azide anion. Thus, the copper site in this structure has a distorted tetrahedral arrangement. The spectroscopic characteristics show, in addition, that the copper sites in the two structures are distinctively different. The Met121Ala mutant still maintains the properties of an ordinary type 1 copper site while the Met121Ala-azide derivative has an absorption maximum at about 409 nm and the copper hyperfine coupling has increased to a value intermediate between those of type 2 copper and the wild-type azurin. Mutant Met121Ala of Pseudomonas aeruginosa azurin and its azide derivative: crystal structures and spectral properties.,Tsai LC, Bonander N, Harata K, Karlsson G, Vanngard T, Langer V, Sjolin L Acta Crystallogr D Biol Crystallogr. 1996 Sep 1;52(Pt 5):950-8. PMID:15299604 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Azurin

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