The non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase GapN is a potential new drug target in Streptococcus pyogenes
The strict human pathogen Streptococcus pyogenes causes infections of varying severity, ranging from self-limiting suppurative infections to life-threatening diseases like necrotizing fasciitis or streptococcal toxic shock syndrome. Here, we show that the non-phosphorylating glyceraldehyde-3-phospha...
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 February 2022
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| In: |
Frontiers in microbiology
Year: 2022, Volume: 13, Pages: 1-18 |
| ISSN: | 1664-302X |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://www.frontiersin.org/article/10.3389/fmicb.2022.802427
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| Author Notes: | Philip Eisenberg, Leon Albert, Jonathan Teuffel, Eric Zitzow, Claudia Michaelis, Jane Jarick, Clemens Sehlke, Lisa Große, Nicole Bader, Ariane Nunes-Alves, Bernd Kreikemeyer, Hermann Schindelin, Rebecca C. Wade and Tomas Fiedler |
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| 520 | |a The strict human pathogen Streptococcus pyogenes causes infections of varying severity, ranging from self-limiting suppurative infections to life-threatening diseases like necrotizing fasciitis or streptococcal toxic shock syndrome. Here, we show that the non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase GapN is an essential enzyme for S. pyogenes. GapN converts glyceraldehyde 3-phosphate into 3-phosphoglycerate coupled to the reduction of NADP to NADPH. The knock-down of gapN by antisense peptide nucleic acids (asPNA) significantly reduces viable bacterial counts of S. pyogenes laboratory and macrolide-resistant clinical strains in vitro. As S. pyogenes lacks the oxidative part of the pentose phosphate pathway, GapN appears to be the major NADPH source for the bacterium. Accordingly, other streptococci that carry a complete pentose phosphate pathway are not prone to asPNA-based gapN knock-down. Determination of the crystal structure of the S. pyogenes GapN apo-enzyme revealed an unusual cis-peptide in proximity to the catalytic binding site. Furthermore, using a structural modeling approach, we correctly predicted competitive inhibition of S. pyogenes GapN by erythrose 4-phosphate, indicating that our structural model can be used for in silico screening of specific GapN inhibitors. In conclusion, the data provided here reveal that GapN is a potential target for antimicrobial substances that selectively kill S. pyogenes and other streptococci that lack the oxidative part of the pentose phosphate pathway. | ||
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