Elucidation of the glycosylation sequence of mithramycin biosynthesis: isolation of 3 A-deolivosylpremithramycin B and its conversion to premithramycin B by glycosyltransferase MtmGII - Nur-e-Alam, M; Méndez, C; Salas, J A; Rohr, J (Chembiochem, 2005)