Abstract
Tryprostatin A and B are indole alkaloid-based fungal products that inhibit mammalian cell cycle at the G2/M phase. They are biosynthetic intermediates of fumitremorgins produced by a complex pathway involving a nonribosomal peptide synthetase (FtmA), a prenyltransferase (FtmB), a cytochrome P450 hydroxylase (FtmC), an O-methyltransferase (FtmD), and several additional enzymes. A partial fumitremorgin biosynthetic gene cluster (ftmABCD) from Aspergillus sp. was reconstituted in Escherichia coli BL21(DE3) cells, with or without the co-expression of an Sfp-type phosphopantetheinyltransferase gene (Cv_sfp) from Chromobacterium violaceum No. 968. Several recombinant E. coli strains produced tryprostatin B up to 106 mg/l or tryprostatin A up to 76 mg/l in the fermentation broth under aerobic condition, providing an effective way to prepare those pharmaceutically important natural products biologically.