Disease-associated mutations in the coil 2B domain of human lamin A/C affect structural properties that mediate dimerization and intermediate filament formation

Fabrizio Gangemi, Massimo Degano

Research output: Contribution to journalArticle

Abstract

The lamin proteins are essential components of the nuclear lamina of eukaryotic cells, that are involved in a complex association mechanism to attain a functional supermolecular structure. Mutations of the lamin A/C gene are associated with several different neuromuscular diseases, and the detailed effect of disease-associated amino acid substitutions on the structure and stability of human lamin dimers is yet unknown. Here we present a structural and thermodynamic characterization by means of molecular dynamics simulations of the effect of pathological mutations (S326T, R331P, R331Q, E347K, E358K, M371K, and R377H) on the association of the coil 2B domains that mediate lamin A/C oligomerization. The structures attained during the simulations, along with the quantification of the contribution of each residue to the dimerization energies, support a lamin association mechanism mediated by homophilic intermolecular interactions promoted by dissociative conformational changes at distinct positions in the coiled coil. The pathogenic mutations can both increase or decrease the stability of lamin A/C dimers, and a possible correlation between the effect of the amino acid substitutions and disease onset and severity is presented.

Original languageEnglish
Pages (from-to)17-28
Number of pages12
JournalJournal of Structural Biology
Volume181
Issue number1
DOIs
Publication statusPublished - Jan 2013

Keywords

  • Free-energy calculations
  • Intermediate filaments
  • Neuromuscular diseases
  • Nuclear lamina
  • Protein stability

ASJC Scopus subject areas

  • Structural Biology

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