9FI9
Human PIF + Z48847594 (OCCUPANCY 0.7)
Summary for 9FI9
| Entry DOI | 10.2210/pdb9fi9/pdb |
| Related | 6HPH |
| Descriptor | ATP-dependent DNA helicase PIF1, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, MAGNESIUM ION, ... (6 entities in total) |
| Functional Keywords | helicase, inhibitor, complex, amppnp, dna binding protein |
| Biological source | Homo sapiens (human) |
| Total number of polymer chains | 1 |
| Total formula weight | 46286.36 |
| Authors | Bax, B.D.,Sanders, C.M.,Antson, A.A.,Brandao-Neto, J. (deposition date: 2024-05-28, release date: 2024-10-02, Last modification date: 2024-10-30) |
| Primary citation | Wever, M.J.A.,Scommegna, F.R.,Egea-Rodriguez, S.,Dehghani-Tafti, S.,Brandao-Neto, J.,Poisson, J.F.,Helfrich, I.,Antson, A.A.,Rodeschini, V.,Bax, B.,Roche, D.,Sanders, C.M. Structure-based discovery of first inhibitors targeting the helicase activity of human PIF1. Nucleic Acids Res., 2024 Cited by PubMed Abstract: PIF1 is a conserved helicase and G4 DNA binding and unwinding enzyme, with roles in genome stability. Human PIF1 (hPIF1) is poorly understood, but its functions can become critical for tumour cell survival during oncogene-driven replication stress. Here we report the discovery, via an X-ray crystallographic fragment screen (XChem), of hPIF1 DNA binding and unwinding inhibitors. A structure was obtained with a 4-phenylthiazol-2-amine fragment bound in a pocket between helicase domains 2A and 2B, with additional contacts to Valine 258 from domain 1A. The compound makes specific interactions, notably through Leucine 548 and Alanine 551, that constrain conformational adjustments between domains 2A and 2B, previously linked to ATP hydrolysis and DNA unwinding. We next synthesized a range of related compounds and characterized their effects on hPIF1 DNA-binding and helicase activity in vitro, expanding the structure activity relationship (SAR) around the initial hit. A systematic analysis of clinical cancer databases is also presented here, supporting the notion that hPIF1 upregulation may represent a specific cancer cell vulnerability. The research demonstrates that hPIF1 is a tractable target through 4-phenylthiazol-2-amine derivatives as inhibitors of its helicase action, setting a foundation for creation of a novel class of anti-cancer therapeutics. PubMed: 39417423DOI: 10.1093/nar/gkae897 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.727 Å) |
Structure validation
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