{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T18:07:30Z","timestamp":1790100450037,"version":"4.0.1"},"reference-count":71,"publisher":"Public Library of Science (PLoS)","issue":"9","license":[{"start":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T00:00:00Z","timestamp":1790035200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS One"],"abstract":"<jats:p>Cyclophilin A (CypA), a key peptidyl-prolyl cis\/trans isomerase, plays a pivotal role in various biological processes and is a target for therapeutic intervention, particularly in viral and cancer-related diseases. This study explores the structural and dynamic effects of Sanglifehrin A (SangfA), a potent CypA inhibitor, using molecular dynamics (MD) simulation. All-atom MD simulations (100 ns) of apo CypA and its complex with SangfA were performed using GROMACS v2023. In addition to MD analyses, essential dynamics, clustering, secondary structure, and binding free energy were analyzed. SangfA binding induces a dual dynamic response: local rigidification of the active-site \u03b22-\u03b23 loop, residues 100\u2013102 and 108\u2013111 with a coil\u2011to\u2011\u03b2-strand transition (\u03b2-sheet content rises from 28.0% to 32.3%), alongside enhanced mobility in distal loops and a 1.1\u2011fold expansion of the conformational ensemble. Principal component analysis shows redistribution of motions from a single dominant mode (apo PC1\u2009=\u200944.2%) to more diffuse fluctuations (holo PC1\u2009=\u200930.4%), increasing configurational entropy. The ligand forms a dynamic hydrogen\u2011bond network (1\u20132 persistent bonds) anchored by Arg55 and hydrophobic contacts with Phe60 and Lys105, while Arg55 remains uninvolved. The computed binding free energy (\u0394G\u2009=\u2009\u221220.45\u2009\u00b1\u20093.07 Kcal\/mol) accords with picomolar potency. SangfA acts via conformational selection, stabilizing a pre\u2011existing CypA substate with augmented \u03b2-structure and broader dynamics. This entropically driven mechanism challenges static inhibition paradigms. Future efforts should validate the \u03b22-\u03b23 loop transition experimentally and exploit the Lys105 contact to design next\u2011generation cyclophilin inhibitors.<\/jats:p>","DOI":"10.1371\/journal.pone.0358847","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T17:31:54Z","timestamp":1790098314000},"page":"e0358847","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["All-atom molecular dynamics simulation of Cyclophilin A in complex with Sanglifehrin A"],"prefix":"10.1371","volume":"21","author":[{"given":"Zahra","family":"Aliabadi","sequence":"first","affiliation":[{"name":"Golestan University of Medical Sciences","place":["Gorgan, Iran"],"department":["Student Research Committee, School of 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