5wgz Citations

Function and Structure of MalA/MalA', Iterative Halogenases for Late-Stage C-H Functionalization of Indole Alkaloids.

Abstract

Malbrancheamide is a dichlorinated fungal indole alkaloid isolated from both Malbranchea aurantiaca and Malbranchea graminicola that belongs to a family of natural products containing a characteristic bicyclo[2.2.2]diazaoctane core. The introduction of chlorine atoms on the indole ring of malbrancheamide differentiates it from other members of this family and contributes significantly to its biological activity. In this study, we characterized the two flavin-dependent halogenases involved in the late-stage halogenation of malbrancheamide in two different fungal strains. MalA and MalA' catalyze the iterative dichlorination and monobromination of the free substrate premalbrancheamide as the final steps in the malbrancheamide biosynthetic pathway. Two unnatural bromo-chloro-malbrancheamide analogues were generated through MalA-mediated chemoenzymatic synthesis. Structural analysis and computational studies of MalA' in complex with three substrates revealed that the enzyme represents a new class of zinc-binding flavin-dependent halogenases and provides new insights into a potentially unique reaction mechanism.

Reviews - 5wgz mentioned but not cited (2)

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Articles - 5wgz mentioned but not cited (1)

  1. Function and Structure of MalA/MalA', Iterative Halogenases for Late-Stage C-H Functionalization of Indole Alkaloids. Fraley AE, Garcia-Borràs M, Tripathi A, Khare D, Mercado-Marin EV, Tran H, Dan Q, Webb GP, Watts KR, Crews P, Sarpong R, Williams RM, Smith JL, Houk KN, Sherman DH. J Am Chem Soc 139 12060-12068 (2017)


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  3. Fungal indole alkaloid biogenesis through evolution of a bifunctional reductase/Diels-Alderase. Dan Q, Newmister SA, Klas KR, Fraley AE, McAfoos TJ, Somoza AD, Sunderhaus JD, Ye Y, Shende VV, Yu F, Sanders JN, Brown WC, Zhao L, Paton RS, Houk KN, Smith JL, Sherman DH, Williams RM. Nat Chem 11 972-980 (2019)
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  12. Analysis of Laboratory-Evolved Flavin-Dependent Halogenases Affords a Computational Model for Predicting Halogenase Site Selectivity. Andorfer MC, Evans D, Yang S, He CQ, Girlich AM, Vergara-Coll J, Sukumar N, Houk KN, Lewis JC. Chem Catal 2 2658-2674 (2022)
  13. Combining OSMAC, metabolomic and genomic methods for the production and annotation of halogenated azaphilones and ilicicolins in termite symbiotic fungi. Hebra T, Pollet N, Touboul D, Eparvier V. Sci Rep 12 17310 (2022)
  14. Enzymatic Late-Stage Halogenation of Peptides. Schnepel C, Moritzer AC, Gäfe S, Montua N, Minges H, Nieß A, Niemann HH, Sewald N. Chembiochem 24 e202200569 (2023)
  15. Mechanism of Action of Flavin-Dependent Halogenases. Barker RD, Yu Y, De Maria L, Johannissen LO, Scrutton NS. ACS Catal 12 15352-15360 (2022)
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  20. Perfect merohedral twinning combined with noncrystallographic symmetry potentially causes the failure of molecular replacement with low-homology search models for the flavin-dependent halogenase HalX from Xanthomonas campestris. Buss M, Geerds C, Patschkowski T, Niehaus K, Niemann HH. Acta Crystallogr F Struct Biol Commun 74 345-350 (2018)
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