3F7K:
reference: Superoxide dismutase from the eukaryotic thermophile Alvinella pompejana: structures, stability, mechanism, and insights into amyotrophic lateral sclerosis., Shin DS, Didonato M, Barondeau DP, Hura GL, Hitomi C, Berglund JA, Getzoff ED, Cary SC, Tainer JA, J Mol Biol. 2009 Feb 6;385(5):1534-55. Epub 2008 Nov 25. PMID: 19063897

This OCA Structure page
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