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-Structure paper
| タイトル | A unique inhibitor conformation selectively targets the DNA polymerase PolC of Gram-positive priority pathogens. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 9784, Year 2025 |
| 掲載日 | 2025年11月6日 |
著者 | Mia Urem / Annemieke H Friggen / Nina Musch / Michael H Silverman / Christopher J Swain / Michael R Barbachyn / Lawrence I Mortin / Xiang Yu / Robert J DeLuccia / Meindert H Lamers / Wiep Klaas Smits / ![]() |
| PubMed 要旨 | Infections with antimicrobial resistant pathogens are a major threat to human health. Inhibitors of the replicative polymerase PolC are a promising novel class of antimicrobials against Gram-positive ...Infections with antimicrobial resistant pathogens are a major threat to human health. Inhibitors of the replicative polymerase PolC are a promising novel class of antimicrobials against Gram-positive pathogens, but the structural basis for their activity remains unknown. The first-in-class PolC-targeting antimicrobial, ibezapolstat, is a guanine analogue in late-stage clinical development for the treatment of Clostridioides difficile infections, and related inhibitors are being developed for systemic treatment of infections with methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE). Here, we present the cryo-electron microscopy structures of Enterococcus faecium PolC bound to DNA and in complex with ibezapolstat or the previously-undescribed inhibitor ACX-801. Both inhibitors form base-pairing interactions with the DNA in the active site, thereby competing with incoming dGTP nucleotides. We identify a crucial susceptibility determinant in PolC that is conserved in other organisms, such as C. difficile. This is explained by an unusual non-planar conformation of the inhibitors that induce a binding pocket in PolC. By combining structural, biochemical, bioinformatic and genetic analyses, this work lays the foundation for the rational development of an innovative class of antimicrobials against Gram-positive priority pathogens. |
リンク | Nat Commun / PubMed:41198680 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.8 - 3.2 Å |
| 構造データ | EMDB-53270, PDB-9qpc: EMDB-53319, PDB-9qrl: EMDB-53320, PDB-9qrn: |
| 化合物 | ![]() PDB-1i88: ![]() ChemComp-ZN: ![]() ChemComp-MG: ![]() ChemComp-HOH: ![]() PDB-1i9t: |
| 由来 |
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キーワード | DNA BINDING PROTEIN / DNA polymerase / inhibitor complex |
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enterococcus faecium (バクテリア)
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