8B3C image
Entry Detail
PDB ID:
8B3C
Keywords:
Title:
Chalcone synthase from Hordeum vulgare complexed with CoA and eriodictyol
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-09-16
Release Date:
2023-09-27
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.23
R-Value Work:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Chalcone synthase 2
Chain IDs:A, B
Chain Length:417
Number of Molecules:2
Biological Source:Hordeum vulgare
Primary Citation
Engineering a Plant Polyketide Synthase for the Biosynthesis of Methylated Flavonoids.
J.Agric.Food Chem. 72 529 539 (2024)
PMID: 38109879 DOI: 10.1021/acs.jafc.3c06785

Abstact

Homoeriodictyol and hesperetin are naturally occurring O-methylated flavonoids with many health-promoting properties. They are produced in plants in low abundance and as complex mixtures of similar compounds that are difficult to separate. Synthetic biology offers the opportunity to produce various flavonoids in a targeted, bottom-up approach in engineered microbes with high product titers. However, the production of O-methylated flavonoids is currently still highly inefficient. In this study, we investigated and engineered a combination of enzymes that had previously been shown to support homoeriodictyol and hesperetin production in Escherichia coli from fed O-methylated hydroxycinnamic acids. We determined the crystal structures of the enzyme catalyzing the first committed step of the pathway, chalcone synthase from Hordeum vulgare, in three ligand-bound states. Based on these structures and a multiple sequence alignment with other chalcone synthases, we constructed mutant variants and assessed their performance in E. coli toward producing methylated flavonoids. With our best mutant variant, HvCHS (Q232P, D234 V), we were able to produce homoeriodictyol and hesperetin at 2 times and 10 times higher titers than reported previously. Our findings will facilitate further engineering of this enzyme toward higher production of methylated flavonoids.

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