1E9Q

Crystal structure of bovine Cu Zn SOD - (1 of 3)

Summary for 1E9Q

• Entry DOI: 10.2210/pdb1e9q/pdb
• Related: 1CB4 1CBJ 1COB 1E9O 1E9P 1SDA 1SXA 1SXB 1SXC 1SXN 1SXS 1SXZ 2SOD 3SOD
• Descriptor: SUPEROXIDE DISMUTASE, COPPER (II) ION, ZINC ION, ... (5 entities in total)
• Functional Keywords: oxidoreductase, sod, enzyme, superoxide, asymmetry
• Biological source: BOS TAURUS; More
• Cellular location: Cytoplasm: P00442 P00442
• Total number of polymer chains: 2
• Total formula weight: 31220.28

Authors

Hough, M.A.,Hasnain, S.S. (deposition date: 2000-10-26, release date: 2000-12-03, Last modification date: 2023-12-13)

Primary citation

Hough, M.A.,Strange, R.W.,Hasnain, S.S.
Conformational Variability of the Cu Site in One Subunit of Bovine Cuzn Superoxide Dismutase: The Importance of Mobility in the Glu119-Leu142 Loop Region for Catalytic Function
J.Mol.Biol., 304:231-, 2000

PubMed Abstract: The structure of the catalytic site in one subunit of bovine CuZn superoxide dismutase is shown to be highly variable. A series of crystal structures at approximately 1.7 A have been determined using data collected from different crystals. Several conformations are observed for the copper site from one of the subunits. These conformations lie between those expected for the Cu(II) and Cu(I) forms of the enzyme and may represent a slow positional rearrangement of the Cu site during the crystallisation process due to the presence of a trace reductant in the mother liquor. These states perhaps indicate some functionally relevant structural steps that ultimately result in the breakage of the imidazolate bridge between the two metal sites. This behaviour is not observed for the second subunit of the dimeric enzyme, which remains in the five-coordinate, distorted square planar geometry in all cases. We suggest that this asymmetric behaviour may be caused by the lack of mobility for the Glu119-Leu142 loop region in the second subunit caused by crystal contacts. This region forms one wall of the active-site cavity, and its mobility has been suggested, via molecular dynamics studies, to be important for the catalytic mechanism.

PubMed: 11080458
DOI: 10.1006/JMBI.2000.4186

Experimental method

X-RAY DIFFRACTION (1.75 Å)