Download MendeleySynthesis of beta-Branched Tryptophan Analogues Using an Engineered Subunit of Tryptophan Synthase.
Herger, M., van Roye, P., Romney, D.K., Brinkmann-Chen, S., Buller, A.R., Arnold, F.H.(2016) J Am Chem Soc 138: 8388-8391
- PubMed: 27355405
- DOI: https://doi.org/10.1021/jacs.6b04836
- Primary Citation of Related Structures:
5IXJ - PubMed Abstract:
We report that l-threonine may substitute for l-serine in the β-substitution reaction of an engineered subunit of tryptophan synthase from Pyrococcus furiosus, yielding (2S,3S)-β-methyltryptophan (β-MeTrp) in a single step. The trace activity of the wild-type β-subunit on this substrate was enhanced more than 1000-fold by directed evolution. Structural and spectroscopic data indicate that this increase is correlated with stabilization of the electrophilic aminoacrylate intermediate. The engineered biocatalyst also reacts with a variety of indole analogues and thiophenol for diastereoselective C-C, C-N, and C-S bond-forming reactions. This new activity circumvents the 3-enzyme pathway that produces β-MeTrp in nature and offers a simple and expandable route to preparing derivatives of this valuable building block.
Organizational Affiliation:
Division of Chemistry and Chemical Engineering 210-41, California Institute of Technology , 1200 East California Boulevard, Pasadena, California 91125, United States.
