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Here, we investigated two structurally related cyclic peptide inhibitors, referred to as CP1 and CP2, which share a conserved macrocyclic framework but differ in the chemical nature of their linker substituents. Molecular dynamics simulations showed that both peptides display broad intramolecular distance distributions in aqueous solution, indicating that key crystallographic contacts are not intrinsically maintained in the unbound state. Upon binding to the protease, CP2 adopted a more defined conformational ensemble and preserved a short intramolecular contact compatible with its crystallographic arrangement, whereas CP1 lost its crystallographic d2 contact and sampled a broader bound-state distribution. CP2 also showed a more focused interaction network involving residues from the catalytic and substrate-recognition regions and more favorable binding free-energy estimates.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Molecular dynamics simulations were performed for each cyclic peptide in aqueous solution and bound to the Zika virus NS2B\/NS3 protease using Amber 20. The protein was described with the ff14SB force field, the cyclic peptides with GAFF2, and the systems were solvated with the TIP3P water model. Three independent 500\u00a0ns simulations were performed for each system. Trajectories were analyzed using structural clustering, intramolecular distance distributions, residue-level interaction analysis, and MM\/PBSA and MM\/GBSA binding free-energy calculations.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00894-026-06945-8","type":"journal-article","created":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T08:02:14Z","timestamp":1788768134000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Comparative molecular dynamics of two cyclic peptide inhibitors bound to the Zika virus NS2B\/NS3 protease"],"prefix":"10.1007","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6162-3848","authenticated-orcid":false,"given":"Camilla Vitoria Silva","family":"Marinho","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2263-2124","authenticated-orcid":false,"given":"Maycon Vinicius Damasceno","family":"de Oliveira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8451-9912","authenticated-orcid":false,"given":"Anderson H.","family":"Lima","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,7]]},"reference":[{"key":"6945_CR1","doi-asserted-by":"publisher","first-page":"140","DOI":"10.1007\/s00705-025-06314-5","volume":"170","author":"ZY Siew","year":"2025","unstructured":"Siew ZY, Seow I, Lim XR, Tang CZ, Djamil FM, Ong GK, Leong PP, Wong ST, Voon K (2025) Arboviruses: the hidden danger of the tropics. 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