rubredoxin family protein. similar to ENH1 (ENHANCER OF SOS3-1), metal ion binding [Arabidopsis thaliana] (TAIR:AT5G17170.1); similar to unknown [Populus trichocarpa x Populus deltoides] (GB:ABK96384.1); contains InterPro domain Rubredoxin-type Fe(Cys)4 protein; (InterPro:IPR004039)