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Article

Inhibition of Pneumolysin Cytotoxicity by Hydrolysable Tannins

1
Institute of Biomedicine, Research Center for Cancer, Infections and Immunity, University of Turku, 20014 Turku, Finland
2
Institute of Biomedicine, Integrative Physiology and Pharmacology, University of Turku, 20014 Turku, Finland
3
Natural Chemistry Research Group, Department of Chemistry, University of Turku, 20500 Turku, Finland
4
Institute of Biomedicine, Bioanalytical Laboratory, University of Turku, 20014 Turku, Finland
5
Biochemistry Faculty of Science and Engineering, Abo Akademi University, 20500 Turku, Finland
*
Author to whom correspondence should be addressed.
Natural Chemistry Research Group, Department of Chemistry, University of Turku, 20520 Turku, Finland.
Antibiotics 2020, 9(12), 930; https://doi.org/10.3390/antibiotics9120930
Received: 13 November 2020 / Revised: 15 December 2020 / Accepted: 16 December 2020 / Published: 21 December 2020
(This article belongs to the Special Issue Therapeutic Approaches to Streptococcal Infections)
Streptococcus pneumoniae causes invasive infections such as otitis media, pneumonia and meningitis. It produces the pneumolysin (Ply) toxin, which forms a pore onto the host cell membrane and has multiple functions in the pathogenesis of S. pneumoniae. The Ply C-terminal domain 4 mediates binding to membrane cholesterol and induces the formation of pores composed of up to 40 Ply monomers. Ply has a key role in the establishment of nasal colonization, pneumococcal transmission from host to host and pathogenicity. Altogether, 27 hydrolysable tannins were tested for Ply inhibition in a hemolysis assay and a tannin-protein precipitation assay. Pentagalloylglucose (PGG) and gemin A showed nanomolar inhibitory activity. Ply oligomerization on the erythrocyte surface was inhibited with PGG. PGG also inhibited Ply cytotoxicity to A549 human lung epithelial cells. Molecular modelling of Ply interaction with PGG suggests that it binds to the pocket formed by domains 2, 3 and 4. In this study, we reveal the structural features of hydrolysable tannins that are required for interaction with Ply. Monomeric hydrolysable tannins containing three to four flexible galloyl groups have the highest inhibitory power to Ply cytotoxicity and are followed by oligomers. Of the oligomers, macrocyclic and C-glycosidic structures were weaker in their inhibition than the glucopyranose-based oligomers. Accordingly, PGG-type monomers and oligomers might have therapeutic value in the targeting of S. pneumoniae infections. View Full-Text
Keywords: Streptococcus pneumoniae; pneumolysin; tannins; pentagalloylglucose; gemin A Streptococcus pneumoniae; pneumolysin; tannins; pentagalloylglucose; gemin A
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MDPI and ACS Style

Maatsola, S.; Kurkinen, S.; Engström, M.T.; Nyholm, T.K.M.; Pentikäinen, O.; Salminen, J.-P.; Haataja, S. Inhibition of Pneumolysin Cytotoxicity by Hydrolysable Tannins. Antibiotics 2020, 9, 930. https://doi.org/10.3390/antibiotics9120930

AMA Style

Maatsola S, Kurkinen S, Engström MT, Nyholm TKM, Pentikäinen O, Salminen J-P, Haataja S. Inhibition of Pneumolysin Cytotoxicity by Hydrolysable Tannins. Antibiotics. 2020; 9(12):930. https://doi.org/10.3390/antibiotics9120930

Chicago/Turabian Style

Maatsola, Santeri, Sami Kurkinen, Marica T. Engström, Thomas K.M. Nyholm, Olli Pentikäinen, Juha-Pekka Salminen, and Sauli Haataja. 2020. "Inhibition of Pneumolysin Cytotoxicity by Hydrolysable Tannins" Antibiotics 9, no. 12: 930. https://doi.org/10.3390/antibiotics9120930

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