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AmbP1 is a cyanobacterial aromatic prenyltransferase and a dedicated synthase for (R)‐3‐geranyl‐3‐isocyanovinyl indolenine (2), the biogenetic precursor for hapalindole‐type alkaloids. The regioselective geranylation of cis‐indolyl vinyl isonitrile (1) by the standalone AmbP1 to give 2 has been shown to require a magnesium ion (Mg2+) to suppress the formation of cis‐2‐geranylindolyl vinyl isonitrile...
The cyanobacterial prenyltransferase AmbP3 catalyzes the reverse prenylation of the tetracyclic indole alkaloid hapalindole U at its C‐2 position. Interestingly, AmbP3 also accepts hapalindole A, a halogenated C‐10 epimer of hapalindole U, and catalyzes normal prenylation at its C‐2 position. The comparison of the two ternary crystal structures, AmbP3‐DMSPP/hapalindole U and AmbP3‐DMSPP/hapalindole...
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