{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,3]],"date-time":"2026-08-03T18:55:40Z","timestamp":1785783340766,"version":"3.56.0"},"reference-count":66,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T00:00:00Z","timestamp":1771372800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100011576","name":"Inonu University Scientific Research Projects Unit","doi-asserted-by":"publisher","award":["FCD-2023-3227"],"award-info":[{"award-number":["FCD-2023-3227"]}],"id":[{"id":"10.13039\/501100011576","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The continuous evolution of SARS-CoV-2 affects its infectivity and ability to evade the immune system. The XBB.1.5 subvariant carries numerous mutations compared to previous Omicron variants and exhibits significant evasion of polyclonal neutralizing antibodies. In this study, the mechanistic effects of mutations in the XBB.1.5 spike protein on structural stability, antigenic markers, and antibody epitopes were analyzed using homology modeling, epitope prediction, protein stability analysis, coarse-grained dynamic simulations, and chain-specific interface mapping. Thirty-eight amino acid substitutions were identified relative to Wuhan-Hu-1, including 22 in the receptor-binding region. The prefusion trimeric fold was conserved, with localized rearrangements in the N-terminal domain, receptor-binding domain, and S1\/S2 region. Linear B-cell epitope prediction yielded similar epitope counts and length distributions in wild-type and XBB.1.5, but only moderate residue-level overlap (Jaccard \u2248 0.40\u20130.62), indicating epitope turnover and alteration of four conserved antigenic determinants. Functional screening suggested that ~45% of substitutions could affect protein function. Chain-specific interface analysis of the A\u2013B protomer interface indicated preserved inter-protomer coupling with modest repacking of the polar\/directional contacts. Overall, XBB.1.5 appears to maintain ACE2 engagement while redistributing antibody targets, underscoring the need for updated vaccine formulations and therapeutic antibodies.<\/jats:p>","DOI":"10.3390\/ijms27041940","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T09:22:46Z","timestamp":1771406566000},"page":"1940","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["SARS-CoV-2 Spike Protein XBB.1.5 Mutations Altered Four Conserved Antigenic Determinants"],"prefix":"10.3390","volume":"27","author":[{"given":"Ekrem","family":"Akbulut","sequence":"first","affiliation":[{"name":"Department of Bioengineering, Malatya Turgut Ozal University, 44900 Malatya, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meltem","family":"Yildirim","sequence":"additional","affiliation":[{"name":"Department of Biomedical Engineering, Malatya Turgut Ozal University, 44900 Malatya, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huseyin","family":"Kahraman","sequence":"additional","affiliation":[{"name":"Department of Biology, Inonu University, 44280 Malatya, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,2,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"11727","DOI":"10.1073\/pnas.2003138117","article-title":"Cell Entry Mechanisms of SARS-CoV-2","volume":"117","author":"Shang","year":"2020","journal-title":"Proc. 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