5WGS image
Entry Detail
PDB ID:
5WGS
Title:
Crystal Structure of MalA' H253F, premalbrancheamide complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-07-14
Release Date:
2017-08-16
Method Details:
Experimental Method:
Resolution:
2.34 Å
R-Value Free:
0.23
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
I 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Flavin-dependent halogenase
Mutations:His253Phe, Leu276Pro, Arg428Pro
Chain IDs:A
Chain Length:667
Number of Molecules:1
Biological Source:Malbranchea aurantiaca
Primary Citation
Function and Structure of MalA/MalA', Iterative Halogenases for Late-Stage C-H Functionalization of Indole Alkaloids.
J. Am. Chem. Soc. 139 12060 12068 (2017)
PMID: 28777910 DOI: 10.1021/jacs.7b06773

Abstact

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.

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