{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T04:28:03Z","timestamp":1772252883470,"version":"3.50.1"},"reference-count":34,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2021,12,18]],"date-time":"2021-12-18T00:00:00Z","timestamp":1639785600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["R01AG055577"],"award-info":[{"award-number":["R01AG055577"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000049","name":"National Institute on Aging","doi-asserted-by":"publisher","award":["R56AG071310"],"award-info":[{"award-number":["R56AG071310"]}],"id":[{"id":"10.13039\/100000049","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["19-15-00184"],"award-info":[{"award-number":["19-15-00184"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Proteolytic processing of amyloid precursor protein (APP) plays a critical role in the pathogenesis of Alzheimer\u2019s disease (AD). Sequential cleavage of APP by \u03b2 and \u03b3 secretases leads to the generation of A\u03b240 (non-amyloidogenic) and A\u03b242 (amyloidogenic) peptides. Presenilin-1 (PS1) or presenilin-2 (PS2) play the role of a catalytic subunit of \u03b3-secretase. Multiple familial AD (FAD) mutations in APP, PS1, or PS2 result in an increased A\u03b242:A\u03b240 ratio and the accumulation of toxic A\u03b242 oligomers and plaques in patient brains. In this study, we perform molecular modeling of the APP complex with \u03b3-secretase and analyze potential effects of FAD mutations in APP and PS1. We noticed that all FAD mutations in the APP transmembrane domain are predicted to cause an increase in the local disorder of its secondary structure. Based on structural analysis of known \u03b3-secretase structures, we propose that APP can form a complex with \u03b3-secretase in 2 potential conformations\u2014M1 and M2. In conformation, the M1 transmembrane domain of APP forms a contact with the perimembrane domain that follows transmembrane domain 6 (TM6) in the PS1 structure. In conformation, the M2 transmembrane domain of APP forms a contact with transmembrane domain 7 (TM7) in the PS1 structure. By analyzing the effects of PS1-FAD mutations on the local protein disorder index, we discovered that these mutations increase the conformational flexibility of M2 and reduce the conformational flexibility of M1. Based on these results, we propose that M2 conformation, but not M1 conformation, of the \u03b3 secretase complex with APP leads to the amyloidogenic (A\u03b242-generating) processing of APP. Our model predicts that APP processing in M1 conformation is favored by curved membranes, such as the membranes of early endosomes. In contrast, APP processing in M2 conformation is likely to be favored by relatively flat membranes, such as membranes of late endosomes and plasma membranes. These predictions are consistent with published biochemical analyses of APP processing at different subcellular locations. Our results also suggest that specific inhibitors of A\u03b242 production could be potentially developed by selectively targeting the M2 conformation of the \u03b3 secretase complex with APP.<\/jats:p>","DOI":"10.3390\/ijms222413600","type":"journal-article","created":{"date-parts":[[2021,12,19]],"date-time":"2021-12-19T20:37:27Z","timestamp":1639946247000},"page":"13600","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Conformational Models of APP Processing by Gamma Secretase Based on Analysis of Pathogenic Mutations"],"prefix":"10.3390","volume":"22","author":[{"given":"Meewhi","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Physiology, UT Southwestern Medical Center at Dallas, Dallas, TX 75390, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7006-6951","authenticated-orcid":false,"given":"Ilya","family":"Bezprozvanny","sequence":"additional","affiliation":[{"name":"Department of Physiology, UT Southwestern Medical Center at Dallas, Dallas, TX 75390, USA"},{"name":"Laboratory of Molecular Neurodegeneration, Peter the Great St. Petersburg State Polytechnical University, 195251 St. Petersburg, Russia"},{"name":"Laboratory of Synaptic Biology, Southern Federal University, 344006 Rostov-on-Don, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"789","DOI":"10.1126\/science.1074069","article-title":"Alzheimer\u2019s disease is a synaptic failure","volume":"298","author":"Selkoe","year":"2002","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"595","DOI":"10.15252\/emmm.201606210","article-title":"The amyloid hypothesis of Alzheimer\u2019s disease at 25 years","volume":"8","author":"Selkoe","year":"2016","journal-title":"EMBO Mol. 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