Out of 36 strains of fungi of the genus Penicillium , some of which were isolated from ancient permafrost, 14 strains synthesized mycophenolic acid (MPA). Maximal (over 500 mg/l) accumulation of MPA in culture liquid was observed in P. brevicompactum strains (VKM F-457, VKM F-477, and VKM F-1150). This was the first study to detect MPA in representatives of the species P. rugulosum ; in three strains of this species , the level of MPA accumulation exceeded 300 mg/l. The time course of the synthesis of MPA by P. rugulosum strain VKM FW-733 was studied. It was shown that the synthesis of this metabolite was dramatically intensified during the stationary growth phase (ten days).
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