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• W2749208817 startingPage "2598" @default.
• W2749208817 abstract "A and B-type lamins are integral scaffolding components of the nuclear lamina which impart rigidity and shape to all metazoan nuclei. Over 450 mutations in A-type lamins are associated with 16 human diseases including dilated cardiomyopathy (DCM). Here, we show that DCM mutants perturb the self-association of lamin A (LA) and it's binding with lamin B1 (LB1). We used confocal and superresolution microscopy (NSIM) to study the effect of LA mutants on the nuclear lamina. We further used circular dichroism, fluorescence spectroscopy and isothermal titration calorimetry (ITC) to probe the structural modulations, self-association and heteropolymeric association of mutant LA. Transfection of mutants in cultured cell lines result in the formation of nuclear aggregates of varied size and distribution. Endogenous LB1 is sequestered into these aggregates. This is consistent with the ten-fold increase in association constant of the mutant proteins compared to the wild type. These mutants exhibit differential heterotypic interaction with LB1, along with significant secondary and tertiary structural alterations of the interacting proteins. Thermodynamic studies demonstrate that the mutants bind to LB1 with different stoichiometry, affinity and energetics. In this report we show that increased self-association propensity of mutant LA modulates the LA-LB1 interaction and precludes the formation of an otherwise uniform laminar network. Our results might highlight the role of homotypic and heterotypic interactions of LA in the pathogenesis of DCM and hence laminopathies in the broader sense." @default.
• W2749208817 created "2017-08-31" @default.
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• W2749208817 date "2017-11-01" @default.
• W2749208817 modified "2023-10-16" @default.
• W2749208817 title "DCM associated LMNA mutations cause distortions in lamina structure and assembly" @default.
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• W2749208817 doi "https://doi.org/10.1016/j.bbagen.2017.08.016" @default.
• W2749208817 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28844980" @default.
• W2749208817 hasPublicationYear "2017" @default.
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