methyl-Co(III)-[methoxylated-aromatic-compound-specific corrinoid protein] + 3,4-dihydroxybenzoate => Co(I)-[methoxylated-aromatic-compound-specific corrinoid protein] + vanillate + H(+)
methyl-co(iii)-[methoxylated-aromatic-compound-specific corrinoid protein] + 3,4-dihydroxybenzoate => co(i)-[methoxylated-aromatic-compound-specific corrinoid protein] + vanillate + h(+)