{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T17:18:46Z","timestamp":1789751926283,"version":"4.0.1"},"reference-count":66,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2025,7,5]],"date-time":"2025-07-05T00:00:00Z","timestamp":1751673600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Vesicle-associated membrane protein (VAMP)-associated protein B (VAPB) serves as a tethering factor that interacts with various proteins and recruits these proteins to the ER surface, exerting multiple functions, such as organelle membrane tethering, lipid transfer between organelles, regulation of calcium homeostasis, autophagy, and the unfolded protein response (UPR). Its interaction is often mediated by its MSP (major sperm) domain, which binds with FFAT (two phenylalanines in an acidic tract)-motif-containing proteins. However, pathogenic variations, such as P56S, P56H, and T46I, in the VAPB MSP domain lead to the familial form of amyotrophic lateral sclerosis (ALS8). Still, the underlying pathophysiology of ALS8 due to pathogenic variations in the VAPB MSP domain remains elusive. In this study, we conducted molecular dynamics (MD) simulations to understand the pathogenic-variant-derived changes in the structural dynamics of the VAPB MSP domain. We found that pathogenic variants altered the fluctuations and conformational dynamics of the VAPB protein. Analyzing the organizations of the secondary structure revealed that pathogenic variants changed the composition of secondary structure elements, especially increasing the proportion of \u03b1-helix while reducing \u03b2-sheet formation, which might affect the organelle tethering and other functions of VAPB, as well as VAPB homodimer and heterodimer formation. Taken together, these findings can be further investigated through in vivo and\/or in vitro studies to not only clarify the pathophysiology of ALS8 resulting from VAPB MSP domain pathogenic variants but also develop novel therapeutics for the disease that restore the native structural organizations as well as fluctuations and motions.<\/jats:p>","DOI":"10.3390\/ijms26136489","type":"journal-article","created":{"date-parts":[[2025,7,7]],"date-time":"2025-07-07T08:58:23Z","timestamp":1751878703000},"page":"6489","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Disclosing Pathogenic Variant Effects on the Structural Dynamics of the VAPB MSP Domain Causing Familial ALS"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9933-7070","authenticated-orcid":false,"given":"Md Abul","family":"Bashar","sequence":"first","affiliation":[{"name":"Department of Pharmacy, Faculty of Biological Sciences, Islamic University, Kushtia 7003, Bangladesh"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nayan","family":"Dash","sequence":"additional","affiliation":[{"name":"Department of Integrative Biotechnology, College of Biotechnology and Bioengineering, Sungkyunkwan University, Suwon 16419, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarmistha","family":"Mitra","sequence":"additional","affiliation":[{"name":"Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4128-5308","authenticated-orcid":false,"given":"Raju","family":"Dash","sequence":"additional","affiliation":[{"name":"Department of New Biology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"331","DOI":"10.1083\/jcb.201607055","article-title":"ACBD5 and VAPB mediate membrane associations between peroxisomes and the ER","volume":"216","author":"Costello","year":"2017","journal-title":"J. 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