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Updated: Mar 16, 2026
10:24
A Fluorescence-based Protocol for Preliminary Screening of Protein Synthesis Inhibitors from Natural Sources
Published on: January 27, 2026
387
Natural Compounds as Inhibitors of Tyrosyl-tRNA Synthetase
Mirosława Skupińska1, Piotr Stępniak2, Iwona Łętowska3
11 Institute of Bioorganic Chemistry , Polish Academy of Sciences, Noskowskiego, Poznan, Poland .
Microbial Drug Resistance (Larchmont, N.Y.)
|August 4, 2016
Summary
Plant-derived compounds like epigallocatechin gallate, acacetin, kaempferide, and chrysin effectively inhibit bacterial tyrosyl-tRNA synthetases (TyrRSs), offering potential antimicrobial therapies.
Area of Science:
- Biochemistry
- Microbiology
- Pharmacology
Background:
- Tyrosyl-tRNA synthetases (TyrRSs) are essential enzymes for protein synthesis in all organisms.
- TyrRSs represent promising therapeutic targets for combating microbial infections.
- Higher plants produce secondary metabolites with potential medicinal properties.
Purpose of the Study:
- To investigate the inhibitory effects of plant-derived secondary metabolites on bacterial aminoacylation reactions.
- To identify potent inhibitors of TyrRS from key bacterial pathogens like Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa.
Main Methods:
- Screening of various polyphenols, alkaloids, and terpenes for inhibitory activity against bacterial TyrRS.
- Enzyme inhibition assays to determine the potency and mechanism of action (e.g., competitive inhibition).
- Structure-activity relationship (SAR) analysis of effective flavonoid inhibitors.
Main Results:
- Epigallocatechin gallate, acacetin, kaempferide, and chrysin demonstrated significant inhibition of E. coli TyrRS.
- Acacetin and chrysin were the primary inhibitors of S. aureus and P. aeruginosa TyrRS.
- Most identified inhibitors acted as competitive inhibitors of the aminoacylation reaction.
- Optimal flavonoid structures for TyrRS inhibition featured hydroxyl groups at positions 5 and 7 of the A ring and a methoxy group at position 4' of the B ring.
Conclusions:
- Plant-derived secondary metabolites, particularly specific flavonoids, can effectively inhibit bacterial TyrRS.
- These findings support the development of novel antimicrobial agents targeting bacterial TyrRS.
- Structure-activity relationship insights can guide the design of more potent and selective TyrRS inhibitors.
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