8XU7 image
Entry Detail
PDB ID:
8XU7
Keywords:
Title:
Crystal structure of Lsd18 in complex with a product
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-01-12
Release Date:
2025-01-15
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Putative epoxidase LasC
Chain IDs:A, B
Chain Length:488
Number of Molecules:2
Biological Source:Streptomyces lasalocidi
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ELY A LYS modified residue
Primary Citation
Structural Basis of Sequential Enantioselective Epoxidation by a Flavin-Dependent Monooxygenase in Lasalocid A Biosynthesis.
Angew.Chem.Int.Ed.Engl. ? e202504982 e202504982 (2025)
PMID: 40199722 DOI: 10.1002/anie.202504982

Abstact

Polyether polyketides are a structurally diverse group of natural products known for their antimicrobial and antiproliferative activities. Lasalocid A is a canonical natural polyether produced by the soil bacterium Streptomyces lasalocidi. In lasalocid A biosynthesis, a polyene polyketide intermediate is converted into a bisepoxide by the flavin-dependent monooxygenase enzyme Lsd18. Remarkably, Lsd18 acts on two distinct C═C groups in the substrate molecule, forming two (R,R) epoxides. We have determined the X-ray crystal structures of Lsd18 in the substrate-free, substrate-bound, and product-bound forms. Our work has revealed that Lsd18 has an extra-large substrate-binding pocket that allows the polyene to adopt different conformations within the enzyme pocket. This feature enables Lsd18 to epoxidate both of the C═C groups. Additionally, a subpocket located near the Lsd18 active site controls stereoselectivity by dictating which face of the C═C group is placed next to the flavin. Molecular understanding of how Lsd18 transforms a polyene into a bisepoxide during lasalocid A biosynthesis lays the foundation for the production of designer polyethers for drug development.

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