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Area of Science:

  • Biochemistry
  • Natural Product Biosynthesis
  • Enzymology

Background:

  • Nature exhibits remarkable synthetic selectivity, particularly in the biosynthesis of complex molecules like paralytic shellfish toxins (PSTs).
  • The precise installation of hydroxyl groups in PSTs, such as saxitoxin, is challenging to replicate using traditional synthetic approaches.
  • Understanding the enzymatic machinery behind PST biosynthesis is crucial for both fundamental knowledge and potential synthetic applications.

Purpose of the Study:

  • To identify and characterize the enzymes responsible for specific C-H functionalizations in paralytic shellfish toxin biosynthesis.
  • To elucidate the roles of Rieske oxygenases in the hydroxylation steps of saxitoxin and related natural product pathways.
  • To investigate the substrate specificity and potential applications of these enzymes in synthesizing saxitoxin congeners.

Main Methods:

  • Identification and characterization of three Rieske oxygenases (SxtT, GxtA, SxtH) involved in PST biosynthesis.
  • Enzymatic assays to determine the site- and stereoselectivity of hydroxylation reactions.
  • Testing the activity of these oxygenases against various saxitoxin-related substrates.

Main Results:

  • Three Rieske oxygenases (SxtT, GxtA, SxtH) were found to mediate highly selective hydroxylation reactions.
  • SxtT hydroxylates a tricyclic precursor to saxitoxin, while GxtA hydroxylates saxitoxin to form gonyautoxins.
  • SxtH hydroxylates a linear substrate before tricycle formation, revising the known biosynthetic pathway.

Conclusions:

  • This study provides the first demonstration of enzymes catalyzing C-H hydroxylation in PST biosynthesis.
  • The characterized Rieske oxygenases exhibit remarkable selectivity and substrate promiscuity, offering potential for synthetic applications.
  • The discovery of SxtH's role rewrites the understanding of the paralytic shellfish toxin biosynthetic route.