Crystal structure of bovine Cu,Zn superoxide dismutase at 3 A resolution: chain tracing and metal ligands.

Journal Article

An electron density map at 3 angstrom resolution has been calculated for Cu2+, Zn2+ superoxide dismutase from bovine erythrocytes, and the course of the main chain has been traced. The dominant structural feature is an 8-stranded barrel of antiparallel beta-pleated sheet. There is one very short helical section and two long loops of non-repetitive structure. The Cu and Zn are bound between the loops and one side of the beta barrel and are about 6 Angstrom apart, with a common histidine ligand. The Cu has four histidine ligands in a somewhat distorted square plane, and the Zn has three histidines and an aspartate in approximately tetrahedral arrangement. The two coppers of a dimer are about 34 Angstrom apart. The two subunits have essentially the same conformation and have an extensive contact area that mainly involves hydrophobic side chain interactions. The overall folding pattern of the polypeptide chain is very similar to that of an immunoglobulin domain.

Full Text

Duke Authors

Cited Authors

  • Richardson, J; Thomas, KA; Rubin, BH; Richardson, DC

Published Date

  • April 1, 1975

Published In

Volume / Issue

  • 72 / 4

Start / End Page

  • 1349 - 1353

PubMed ID

  • 1055410

International Standard Serial Number (ISSN)

  • 0027-8424

Language

  • eng

Conference Location

  • United States