Dilysine motifs in exon 2b of SMN protein mediate binding to the COPI vesicle protein α-COP and neurite outgrowth in a cell culture model of spinal muscular atrophy

dc.contributor.authorCuster, Sara K.
dc.contributor.authorTodd, Adrian G.
dc.contributor.authorSingh, Natalia N.
dc.contributor.authorAndrophy, Elliot J.
dc.contributor.departmentDepartment of Dermatology, School of Medicineen_US
dc.date.accessioned2015-11-03T21:04:30Z
dc.date.available2015-11-03T21:04:30Z
dc.date.issued2013-10-15
dc.description.abstractSpinal muscular atrophy (SMA) is a devastating neuromuscular disorder that stems from low levels of survival of motor neuron (SMN) protein. The processes that cause motor neurons and muscle cells to become dysfunctional are incompletely understood. We are interested in neuromuscular homeostasis and the stresses put upon that system by loss of SMN. We recently reported that α-COP, a member of the coatomer complex of coat protein I (COPI) vesicles, is an SMN-binding partner, implicating this protein complex in normal SMN function. To investigate the functional significance of the interaction between α-COP and SMN, we constructed an inducible NSC-34 cell culture system to model the consequences of SMN depletion and find that depletion of SMN protein results in shortened neurites. Heterologous expression of human SMN, and interestingly over-expression of α-COP, restores normal neurite length and morphology. Mutagenesis of the canonical COPI dilysine motifs in exon 2b results in failure to bind to α-COP and abrogates the ability of human SMN to restore neurite outgrowth in SMN-depleted motor neuron-like NSC-34 cells. We conclude that the interaction between SMN and α-COP serves an important function in the growth and maintenance of motor neuron processes and may play a significant role in the pathogenesis of SMA.en_US
dc.identifier.citationCuster, S. K., Todd, A. G., Singh, N. N., & Androphy, E. J. (2013). Dilysine motifs in exon 2b of SMN protein mediate binding to the COPI vesicle protein α-COP and neurite outgrowth in a cell culture model of spinal muscular atrophy. Human Molecular Genetics, 22(20), 4043–4052. http://doi.org/10.1093/hmg/ddt254en_US
dc.identifier.urihttps://hdl.handle.net/1805/7327
dc.language.isoen_USen_US
dc.publisherOxford Journalsen_US
dc.relation.isversionof10.1093/hmg/ddt254en_US
dc.relation.journalHuman Molecular Geneticsen_US
dc.rightsPublisher Policyen_US
dc.sourcePMCen_US
dc.subjectspinal muscular atrophyen_US
dc.subjectsurvival motor neuronen_US
dc.subjectα-COPen_US
dc.subjectmotor neuronen_US
dc.subjectcoat protein Ien_US
dc.subjectcoatomeren_US
dc.subjectcoated vesiclesen_US
dc.subjectCOPIen_US
dc.titleDilysine motifs in exon 2b of SMN protein mediate binding to the COPI vesicle protein α-COP and neurite outgrowth in a cell culture model of spinal muscular atrophyen_US
dc.typeArticleen_US
ul.alternative.fulltexthttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3988423/en_US
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