Abstract |
The nuclear face of the nuclear membrane is enriched with the intermediate filament protein lamin A. Mutations in LMNA, the gene encoding lamin A, lead to a diverse set of inherited conditions including myopathies that affect both the heart and skeletal muscle. To gain insight about lamin A protein interactions, binding proteins associated with the tail of lamin A were characterized. Of 130 nuclear proteins found associated with the lamin A tail, 17 (13%) were previously described lamin A binding partners. One protein not previously linked to lamin A, matrin-3, was selected for further study, because like LMNA mutations, matrin-3 has also been implicated in inherited myopathy. Matrin-3 binds RNA and DNA and is a nucleoplasmic protein originally identified from the insoluble nuclear fraction, referred to as the nuclear matrix. Anti-matrin-3 antibodies were found to co-immunoprecipitate lamin A, and the lamin-A binding domain was mapped to the carboxy-terminal half of matrin-3. Three-dimensional mapping of the lamin A-matrin-3 interface showed that the LMNA truncating mutation Δ303, which lacks the matrin-3 binding domain, was associated with an increased distance between lamin A and matrin-3. LMNA mutant cells are known to have altered biophysical properties and the matrin-3-lamin A interface is positioned to contribute to these defects.
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Authors | Frederic F Depreux, Megan J Puckelwartz, Aleksandra Augustynowicz, Don Wolfgeher, Christine M Labno, Dynora Pierre-Louis, Danielle Cicka, Stephen J Kron, James Holaska, Elizabeth M McNally |
Journal | Human molecular genetics
(Hum Mol Genet)
Vol. 24
Issue 15
Pg. 4284-95
(Aug 01 2015)
ISSN: 1460-2083 [Electronic] England |
PMID | 25948554
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Copyright | © The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: [email protected]. |
Chemical References |
- Antibodies, Anti-Idiotypic
- LMNA protein, human
- Lamin Type A
- MATR3 protein, human
- Nuclear Matrix-Associated Proteins
- RNA-Binding Proteins
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Topics |
- Antibodies, Anti-Idiotypic
- Binding Sites
- Humans
- Lamin Type A
(genetics, metabolism)
- Muscle, Skeletal
(metabolism, pathology)
- Muscular Diseases
(genetics, metabolism, pathology)
- Mutation
- Nuclear Matrix-Associated Proteins
(genetics, metabolism)
- Protein Binding
- RNA-Binding Proteins
(genetics, metabolism)
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