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A computer-aided drug design (CADD) protocol was applied to investigate pyrazolone derivatives with reported antitrypanosomal activity and their putative interaction with cruzain (Cz), a cysteine protease essential for parasite survival. A 2D-QSAR model built from a curated set of 33 phenyl-dihydropyrazolone derivatives guided the design of four new candidates (LMM1\u2013LMM4), which showed intermediate predicted antitrypanosomal activity within the chemical space of the original pyrazolone series. Molecular docking identified favorable binding within the Cz active site, with contacts at residues Ser61, Gly66, and Leu67. MD simulations indicated overall structural stability of the protein\u2013ligand complexes and revealed ligand-dependent conformational behavior within the Cz binding site. MM\/GBSA calculations suggested that van der Waals interactions are major contributors to the computed binding energies; however, the MM\/GBSA ranking did not fully reproduce the phenotypic antitrypanosomal activity trend. Per-residue decomposition and free energy landscape analyses were therefore interpreted qualitatively, suggesting that contacts with S2\/S3 subsite residues and conformational adaptability may contribute to Cz recognition but do not, alone, explain whole-cell potency. These findings support pyrazolones as antitrypanosomal scaffolds and provide structural hypotheses for future experimental validation against Cz.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Molecular geometries were optimized at the PM6 level (MOPAC2016); descriptors were calculated with ChemDes and UseGalaxy, selected via OPS and a genetic algorithm (QSARINS), and the QSAR model was built using PLS regression\u00a0(QSAR modeling software). Molecular docking was performed with GOLD, FITTED, and AutoDock Vina 1.2.3 against Cz (PDB: 3KKU). ADMET properties were predicted using OSIRIS Property Explorer, SwissADME, and ADMET-AI. Partial atomic charges were derived at the HF\/6-31G* level with RESP fitting (Gaussian 09); MD simulations (3\u2009\u00d7\u2009250\u00a0ns per system) were run with AMBER20 using GAFF\/ff14SB force fields and TIP3P solvent. Binding free energies were calculated by MM\/GBSA (MMPBSA.py).<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00894-026-06923-0","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T07:41:27Z","timestamp":1788939687000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Molecular modeling design of antitrypanosomal pyrazolone derivatives targeting Chagas disease: QSAR, docking, molecular dynamics and free energy calculations"],"prefix":"10.1007","volume":"32","author":[{"given":"Karen Karla F.","family":"Sousa","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana Beatriz S.","family":"Barbosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F\u00e1bio Jos\u00e9 B.","family":"Cardoso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2310-5107","authenticated-orcid":false,"given":"Jos\u00e9 Rog\u00e9rio A.","family":"Silva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6773-6923","authenticated-orcid":false,"given":"F\u00e1bio A.","family":"Molfetta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,9]]},"reference":[{"key":"6923_CR1","doi-asserted-by":"publisher","first-page":"100946","DOI":"10.1016\/j.lanmic.2024.07.009","volume":"5","author":"C Forsyth","year":"2024","unstructured":"Forsyth C, Agudelo Higuita NI, Hamer SA, Ibarra-Cerde\u00f1a CN, Valdez-Tah A, Stigler Granados P, Hamer GL, Vingiello M, Beatty NL (2024) Climate change and Trypanosoma cruzi transmission in North and Central America. 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