TY - JOUR AU - Szakonyi, Gerda TI - Protein engineering - a biológiai gyógyszerek racionális tervezése JF - GYÓGYSZERÉSZET J2 - GYÓGYSZERÉSZET VL - 6 PY - 2023 SP - 294 EP - 303 PG - 10 SN - 0017-6036 UR - https://m2.mtmt.hu/api/publication/34423770 ID - 34423770 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Tököli, Attila AU - Bodnár, Brigitta AU - Bogár, Ferenc AU - Paragi, Gábor AU - Hetényi, Anasztázia AU - Bartus, Éva AU - Wéber, Edit AU - Hegedüs, Zsófia AU - Szabó, Zoltán AU - Kecskeméti, Gábor AU - Szakonyi, Gerda AU - Martinek, Tamás TI - Structural Adaptation of the Single-Stranded DNA-Binding Protein C-Terminal to DNA Metabolizing Partners Guides Inhibitor Design JF - PHARMACEUTICS J2 - PHARMACEUTICS VL - 15 PY - 2023 IS - 4 PG - 17 SN - 1999-4923 DO - 10.3390/pharmaceutics15041032 UR - https://m2.mtmt.hu/api/publication/33712712 ID - 33712712 N1 - Department of Medical Chemistry, University of Szeged, Szeged, H6720, Hungary ELKH-SZTE Biomimetic Systems Research Group, Eötvös Loránd Research Network (ELKH), Szeged, H6720, Hungary Institute of Physics, University of Pécs, Pécs, H7624, Hungary Department of Theoretical Physics, University of Szeged, Szeged, H6720, Hungary Institute of Pharmaceutical Analysis, University of Szeged, Szeged, H6720, Hungary Export Date: 8 September 2023 Correspondence Address: Martinek, T.A.; Department of Medical Chemistry, Hungary; email: martinek.tamas@med.u-szeged.hu AB - Single-stranded DNA-binding protein (SSB) is a bacterial interaction hub and an appealing target for antimicrobial therapy. Understanding the structural adaptation of the disordered SSB C-terminus (SSB-Ct) to DNA metabolizing enzymes (e.g., ExoI and RecO) is essential for designing high-affinity SSB mimetic inhibitors. Molecular dynamics simulations revealed the transient interactions of SSB-Ct with two hot spots on ExoI and RecO. The residual flexibility of the peptide–protein complexes allows adaptive molecular recognition. Scanning with non-canonical amino acids revealed that modifications at both termini of SSB-Ct could increase the affinity, supporting the two-hot-spot binding model. Combining unnatural amino acid substitutions on both segments of the peptide resulted in enthalpy-enhanced affinity, accompanied by enthalpy–entropy compensation, as determined by isothermal calorimetry. NMR data and molecular modeling confirmed the reduced flexibility of the improved affinity complexes. Our results highlight that the SSB-Ct mimetics bind to the DNA metabolizing targets through the hot spots, interacting with both of segments of the ligands. 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