8WM1 image
Entry Detail
PDB ID:
8WM1
Keywords:
Title:
DHS dehydratase
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2023-10-02
Release Date:
2024-10-02
Method Details:
Experimental Method:
Resolution:
2.74 Å
R-Value Free:
0.25
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:3-dehydroshikimate dehydratase (DHS dehydratase)
Chain IDs:A, B, C, D
Chain Length:484
Number of Molecules:4
Biological Source:Acinetobacter pittii PHEA-2
Ligand Molecules
Primary Citation
Efficient production of protocatechuic acid using systems engineering of Escherichia coli.
Metab Eng 82 134 146 (2024)
PMID: 38369051 DOI: 10.1016/j.ymben.2024.02.003

Abstact

Protocatechuic acid (3, 4-dihydroxybenzoic acid, PCA) is widely used in the pharmaceuticals, health food, and cosmetics industries owing to its diverse biological activities. However, the inhibition of 3-dehydroshikimate dehydratase (AroZ) by PCA and its toxicity to cells limit the efficient production of PCA in Escherichia coli. In this study, a high-level strain of 3-dehydroshikimate, E. coli DHS01, was developed by blocking the carbon flow from the shikimate-overproducing strain E. coli SA09. Additionally, the PCA biosynthetic pathway was established in DHS01 by introducing the high-activity ApAroZ. Subsequently, the protein structure and catalytic mechanism of 3-dehydroshikimate dehydratase from Acinetobacter pittii PHEA-2 (ApAroZ) were clarified. The variant ApAroZR363A, achieved by modulating the conformational dynamics of ApAroZ, effectively relieved product inhibition. Additionally, the tolerance of the strain E. coli PCA04 to PCA was enhanced by adaptive laboratory evolution, and a biosensor-assisted high-throughput screening method was designed and implemented to expedite the identification of high-performance PCA-producing strains. Finally, in a 5 L bioreactor, the final strain PCA05 achieved the highest PCA titer of 46.65 g/L, a yield of 0.23 g/g, and a productivity of 1.46 g/L/h for PCA synthesis from glucose using normal fed-batch fermentation. The strategies described herein serve as valuable guidelines for the production of other high-value and toxic products.

Legend

Protein

Chemical

Disease

Primary Citation of related structures