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Pyridoxal 5'-Phosphate-Dependent Enzymatic Decarboxylative Annulation.

Weiwei Chai1, Shenggan Luo2,3, Wenhui Xi1

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Summary

Researchers developed a new biocatalytic method to access the rare vinylglycine quinonoid (VGQ) intermediate. This innovation enables novel enzymatic reactions for creating complex molecules, expanding the utility of PLP-dependent enzymes.

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Area of Science:

  • Enzyme engineering and biocatalysis
  • Organic chemistry
  • Structural biology

Background:

  • Pyridoxal 5'-phosphate (PLP)-dependent enzymes are highly versatile biocatalysts.
  • Transformations involving the vinylglycine quinonoid (VGQ) intermediate are rare, limiting their application.
  • Understanding VGQ reactivity is key to developing novel PLP-dependent biocatalysts.

Purpose of the Study:

  • To establish a biocatalytic platform for accessing and exploiting the reactivity of the VGQ intermediate.
  • To enable new enzymatic transformations using this high-energy intermediate.
  • To expand the catalytic repertoire of PLP-dependent enzymes.

Main Methods:

  • Reprogramming of the SphA enzyme, a PLP-dependent enzyme, to generate VGQ *in situ*.
  • Utilizing vinylaminomalonate decarboxylation to form VGQ.
  • Performing a decarboxylative [3 + 2] annulation reaction with electron-deficient alkenes.
  • Employing crystallographic, computational, and mutagenesis studies for mechanistic elucidation.

Main Results:

  • A novel biocatalytic platform was successfully established to access the VGQ intermediate.
  • The platform enabled a decarboxylative [3 + 2] annulation between vinylaminomalonate and electron-deficient alkenes.
  • Key mechanistic features of this abiotic transformation were revealed through structural and computational analyses.

Conclusions:

  • The study demonstrates the latent [3 + 2] annulating potential of the VGQ intermediate.
  • This work expands the catalytic capabilities of PLP-dependent enzymes.
  • A new strategy for the enzymatic synthesis of complex carbocyclic architectures has been established.