Characterisation of two polyketide methyltransferases involved in the biosynthesis of the antitumor drug mithramycin by Streptomyces argillaceus - Lozano, M J; Remsing, L L; Quirós, L M; Braña, A F; Fernández, E; Sánchez, C; Méndez, C; Rohr, J; Salas, J A (J Biol Chem, 2000)