6l1v

Domain-swapped Alcaligenes xylosoxidans azurin dimer

spinqualitylabelsall models 6l1v, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6l1v is a 4 chain structure with sequence from Achromobacter xylosoxidans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.25Å Ligands: CU Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AZUR1_ALCXX Transfers electrons from cytochrome c551 to cytochrome oxidase. Publication Abstract from PubMed Protein oligomers have gained interest, owing to their increased knowledge in cells and promising utilization for future materials. Various proteins have been shown to 3D domain swap, but there has been no domain swapping report on a blue copper protein. Here, we found that azurin from Alcaligenes xylosoxidans oligomerizes by the procedure of 2,2,2-trifluoroethanol addition to Cu(i)-azurin at pH 5.0, lyophilization, and dissolution at pH 7.0, whereas it slightly oligomerizes when using Cu(ii)-azurin. The amount of high order oligomers increased with the addition of Cu(ii) ions to the dissolution process of a similar procedure for apoazurin, indicating that Cu(ii) ions enhance azurin oligomerization. The ratio of the absorbance at 460 nm to that at approximately 620 nm of the azurin dimer (Abs460/Abs618 = 0.113) was higher than that of the monomer (Abs460/Abs622 = 0.067) and the EPR A || value of the dimer (5.85 mT) was slightly smaller than that of the monomer (5.95 mT), indicating a slightly more rhombic copper coordination for the dimer. The redox potential of the azurin dimer was 342 +/- 5 mV vs. NHE, which was 50 mV higher than that of the monomer. According to X-ray crystal analysis, the azurin dimer exhibited a domain-swapped structure, where the N-terminal region containing three beta-strands was exchanged between protomers. The copper coordination structure was tetrahedrally distorted in the azurin dimer, similar to that in the monomer; however, the Cu-O(Gly45) bond length was longer for the dimer (monomer, 2.46-2.59 A; dimer, 2.98-3.25 A). These results open the door for designing oligomers of blue copper proteins by domain swapping. 3D domain swapping of azurin from Alcaligenes xylosoxidans.,Cahyono RN, Yamanaka M, Nagao S, Shibata N, Higuchi Y, Hirota S Metallomics. 2020 Jan 20. doi: 10.1039/c9mt00255c. PMID:31956880 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Azurin 3D structures

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