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TitleMissense variants in CMS22 patients reveal that PREPL has both enzymatic and nonenzymatic functions.
Journal, issue, pagesJCI Insight, Vol. 9, Issue 17, Year 2024
Publish dateSep 10, 2024
AuthorsYenthe Monnens / Anastasia Theodoropoulou / Karen Rosier / Kritika Bhalla / Alexia Mahy / Roeland Vanhoutte / Sandra Meulemans / Edoardo Cavani / Aleksandar Antanasijevic / Irma Lemmens / Jennifer A Lee / Catherine J Spellicy / Richard J Schroer / Ricardo A Maselli / Chamindra G Laverty / Patrizia Agostinis / David J Pagliarini / Steven Verhelst / Maria J Marcaida / Anne Rochtus / Matteo Dal Peraro / John Wm Creemers /
PubMed AbstractCongenital myasthenic syndrome-22 (CMS22, OMIM 616224) is a rare genetic disorder caused by deleterious genetic variation in the prolyl endopeptidase-like (PREPL) gene. Previous reports have ...Congenital myasthenic syndrome-22 (CMS22, OMIM 616224) is a rare genetic disorder caused by deleterious genetic variation in the prolyl endopeptidase-like (PREPL) gene. Previous reports have described patients with deletions and nonsense variants in PREPL, but nothing is known about the effect of missense variants in the pathology of CMS22. In this study, we have functionally characterized missense variants in PREPL from 3 patients with CMS22, all with hallmark phenotypes. Biochemical evaluation revealed that these missense variants do not impair hydrolase activity, thereby challenging the conventional diagnostic criteria and disease mechanism. Structural analysis showed that the variants affect regions most likely involved in intraprotein or protein-protein interactions. Indeed, binding to a selected group of known interactors was differentially reduced for the 3 variants. The importance of nonhydrolytic functions of PREPL was investigated in catalytically inactive PREPL p.Ser559Ala cell lines, which showed that hydrolytic activity of PREPL is needed for normal mitochondrial function but not for regulating AP1-mediated transport in the transgolgi network. In conclusion, these studies showed that CMS22 can be caused not only by deletion and truncation of PREPL but also by missense variants that do not necessarily result in a loss of hydrolytic activity of PREPL.
External linksJCI Insight / PubMed:39078710 / PubMed Central
MethodsEM (single particle)
Resolution4.01 Å
Structure data

19117

8rfb

EMDB-19117, PDB-8rfb:
Cryo-EM structure of the R243C mutant of human Prolyl Endopeptidase-Like (PREPL) protein involved in Congenital myasthenic syndrome-22 (CMS22)
Method: EM (single particle) / Resolution: 4.01 Å

Source
  • homo sapiens (human)
KeywordsHYDROLASE / thio-esterase

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