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Halenaquinol Blocks Staphylococcal Protein A Anchoring on Cell Wall Surface by Inhibiting Sortase A in Staphylococcus
Jaepil Lee1, Jae-Hyeong Choi2,3, Jayho Lee1
1Department of Agricultural Biotechnology, College of Agriculture and Life Sciences and Natural Products Research Institute, Seoul National University, Seoul 08826, Republic of Korea.
Marine sponge compounds, like halenaquinol, inhibit Sortase A (SrtA) activity, blocking surface protein anchoring in Staphylococcus aureus. This discovery offers potential new anti-infective strategies against bacterial virulence.
Area of Science:
- Marine Natural Products Chemistry
- Microbiology
- Biochemistry
Background:
- Sortase A (SrtA) is essential for anchoring surface proteins to the bacterial cell wall.
- Staphylococcus aureus virulence is linked to SrtA-mediated protein display.
Purpose of the Study:
- To identify inhibitors of Sortase A (SrtA) from marine natural products.
- To elucidate the mechanism of SrtA inhibition by marine pentacyclic polyketides.
Main Methods:
- Isolation and structural elucidation of compounds from marine sponge Xestospongia sp.
- Biochemical assays to determine SrtA inhibitory activity (IC50).
- Molecular biology techniques including RT-PCR, Western blot, and immunofluorescence microscopy.
Main Results:
- Six pentacyclic polyketides were isolated; halenaquinol showed potent SrtA inhibition (IC50 = 13.94 μM).
- Halenaquinol does not affect srtA or spA gene transcription.
- Halenaquinol inhibits Sortase A activity, preventing surface protein A (SpA) anchoring to the cell wall.
Conclusions:
- Halenaquinol effectively inhibits SrtA-mediated SpA cell wall anchoring in S. aureus.
- Marine-derived pentacyclic polyketides are promising candidates for anti-infective drug development targeting S. aureus virulence.
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