8K5S image
Entry Detail
PDB ID:
8K5S
Keywords:
Title:
The structure of EntE with 3-(prop-2-yn-1-yloxy)benzoic acid sulfamoyl adenosine
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-07-24
Release Date:
2024-07-31
Method Details:
Experimental Method:
Resolution:
2.65 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
I 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Enterobactin synthase component E
Mutations:N235G
Chain IDs:A, B
Chain Length:556
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Biosynthetic Incorporation of Non-native Aryl Acid Building Blocks into Peptide Products Using Engineered Adenylation Domains.
Acs Chem.Biol. 19 2569 2579 (2024)
PMID: 39620357 DOI: 10.1021/acschembio.4c00663

Abstact

Nonribosomal peptides (NRPs), one of the most widespread secondary metabolites in nature, with therapeutically significant activities, are biosynthesized by modular nonribosomal peptide synthetases (NRPSs). Aryl acids contribute to the structural diversity of NRPs as well as nonproteinogenic amino acids and keto acids. We previously confirmed that a single Asn-to-Gly substitution in the 2,3-dihydroxybenzoic acid-activating adenylation (A) domain EntE involved in enterobactin biosynthesis accepts monosubstituted benzoic acid derivatives with nitro, cyano, bromo, and iodo functionalities at the 2 or 3 positions. Here, we showed that the mutant EntE (N235G) accommodates various disubstituted benzoic acid derivatives with halogen, methyl, methoxy, nitro, and cyano functionalities at the 2 and 3 positions and monosubstituted benzoic acid with an alkyne at the 3 position. Structural analysis of the mutant EntE (N235G) with nonhydrolyzable aryl-AMP analogues using 3-chloro-2-methylbenzoic acid and 3-prop-2-ynoxybenzoic acid revealed how bulky 3-chloro-2-methylbenzoic acid and clickable 3-prop-2-ynoxybenzoic acid are recognized by enlarging the substrate-binding pocket of the enzyme. When engineered EntE mutants were coupled with enterobactin and vibriobactin biosynthetic enzymes, 3-hydroxybenzoic acid-, salicylic acid-, and 3-bromo-2-fluorobenzoic acid-containing peptides were produced as early stage intermediates, highlighting the potential of NRP biosynthetic pathway engineering for constructing diverse aryl acid-containing metabolites.

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