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A Tandem Liquid Chromatography–Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus

A Tandem Liquid Chromatography–Mass Spectrometry-based Approach for Metabolite Analysis of Staphylococcus aureus

Published on: March 28, 2017

Metabolic reprogramming promotes Staphylococcus aureus serum resistance.

Samuel J Fenn^1,2, Edward J A Douglas^3,4,5, Ruth C Massey^1,2,3

¹School of Microbiology, University College Cork, Cork, Ireland.

Microbiology (Reading, England)

|June 2, 2026

Summary

A Staphylococcus aureus mutation (V76I) in dihydrolipoamide dehydrogenase enhances survival in human blood by increasing resistance to antimicrobials and boosting replication, offering new therapeutic targets.

Keywords:

Staphylococcus aureus dihydrolipoamide dehydrogenase metabolism serum resistance

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Published on: February 19, 2019

Area of Science:

Microbiology and Infectious Diseases
Molecular Biology
Genomics

Background:

Staphylococcus aureus bloodstream infections cause significant mortality worldwide.
Previous functional genomics identified polygenic adaptation to human serum.
A specific mutation (V76I) in dihydrolipoamide dehydrogenase (PdhD) enhances S. aureus survival.

Purpose of the Study:

To elucidate the mechanisms by which the PdhD V76I mutation improves S. aureus survival in human serum.
To investigate the role of enhanced antimicrobial resistance and metabolic activity in host adaptation.

Main Methods:

Functional genomics and strain characterization.
Measurement of diaphorase activity and NADH/NAD+ recycling.
Assessment of bacterial resistance to host-derived antimicrobials (e.g., LL37, fatty acids) and antibiotics (e.g., gentamicin).
Analysis of bacterial growth, membrane potential, and metabolic pathways (glycolysis, TCA cycle) in human serum.

Main Results:

The PdhD V76I variant exhibits enhanced diaphorase activity, facilitating NADH recycling and decreasing membrane potential.
Strains expressing PdhD V76I show increased resistance to antimicrobial peptides, fatty acids, gentamicin, and hydrogen peroxide.
This mutation enhances glycolysis and TCA cycle activity, promoting bacterial replication in serum without typical persister/SCV phenotypes.

Conclusions:

The PdhD V76I mutation confers enhanced survival in the bloodstream by improving resistance to host defenses and boosting metabolic activity.
This study reveals intermediate adaptation phenotypes contributing to S. aureus survival in hostile host environments.
Understanding these host adaptation mechanisms is crucial for developing novel therapeutics targeting S. aureus infections.