Component of the dicamba O-demethylase multicomponent enzyme system involved in the degradation of the herbicide dicamba (PubMed:15855162, PubMed:15820213, PubMed:16535584). In vitro, functions as an intermediate electron transfer protein (PubMed:15855162, PubMed:15820213, PubMed:16535584). Binds 1 [2Fe-2S] cluster. Monomer (PubMed:15820213). The dicamba O-demethylase multicomponent enzyme system is composed of an oxygenase component (DdmC) and an electron transfer component formed by a ferredoxin reductase (DdmA1) and a ferredoxin (DdmB) (PubMed:15855162, PubMed:15820213, PubMed:16535584). In vitro, dicamba O-demethylase assays in which DdmA2 is substituted for DdmA1 demonstrate that the two enzymes possess nearly identical activities (PubMed:15855162). Belongs to the adrenodoxin/putidaredoxin family.