The Steap proteins are metalloreductases.

By R. Ohgami, D. Campagna, A. Mcdonald, M. Fleming. Blood, 2006

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Genome-wide Methylation Profiles Reveal Quantitative Views of Human Aging Rates (2012, positive): “STEAP2 is known to play a role in maintaining homeostasis of iron and copper—metals that serve as essential components of the mitochondrial respiratory chain (Ohgami et al., 2006).”
Iron uptake mechanisms in plants: Functions of the FRO family of ferric reductases (2009, background): “As mentioned above, yeast FRE6 and mammalian STEAP1-4 localize to internal membranes and function as ferric chelate reductases [47–59].”
Cuproptosis: mechanisms and links with cancers (2023, background): “After being transported to the cell surface in the blood, divalent copper ions are reduced to monovalent copper ions catalyzed by steap proteins [32], which are bound and maintained in the reduced state by two His-Met-Asp clusters at the nitrogen terminus of CTR [33], and thus transported into the c”
Mechanisms for copper acquisition, distribution and regulation. (2008, background): “The recent identification of a family of metalloreductases in humans—the Steap proteins, which are localized to both the plasma membrane and intracellular membranes—suggests the possibility that human Ctr1 might also function in concert with a metalloreductase for Cu 1+ movement across membrane”