Rubrerythrin-like domain, similar to rubrerythrin, a nonheme iron binding domain found in many air-sensitive bacteria and archaea, and member of a broad superfamily of ferritin-like diiron-carboxylate proteins. Rubrerythrin is thought to reduce hydrogen peroxide as part of an oxidative stress protection system. The rubrerythrin protein has two domains, a binuclear metal center located within a four-helix bundle of the rubrerythrin domain, and a rubredoxin domain. The Rubrerythrin-like domains in this CD are singular domains (no C-terminus rubredoxin domain) and are phylogenetically distinct from rubrerythrin domains of rubrerythrin-rubredoxin proteins.