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Journal of Molecular Medicine

, Volume 87, Issue 12, pp 1207–1219 | Cite as

Disease mutations in the “head” domain of the extra-sarcomeric protein desmin distinctly alter its assembly and network-forming properties

  • Sarika Sharma
  • Norbert Mücke
  • Hugo A. Katus
  • Harald Herrmann
  • Harald Bär
Original Article

Abstract

The intermediate filament protein desmin generates an extra-sarcomeric network in myocytes. Mutations in the desmin gene cause myofibrillar myopathy characterized by desmin-positive aggregates and myofibrillar dissolution. Past analysis revealed that the non-α-helical amino-terminal “head” domain of desmin is a vital coordinator of protein assembly. We have now characterized assembly and network-forming properties of five recently discovered myopathy-causing mutations residing in this domain. In vitro analyses with recombinant proteins show that two mutant variants residing in a conserved nonapeptide motif “SSYRRTFGG”—Ser13Phe and Arg16Cys—interfere with assembly by forming filamentous aggregates. Consistent with in vitro data, both mutant proteins are unable to generate a bona fide filament system in cells lacking an intermediate filament cytoskeleton. In cells expressing vimentin or desmin, both mutants firstly fail to integrate into the endogenous filament network and secondly severely affect its cellular localization. The other three mutations—Ser2Iso, Ser46Phe, and Ser46Tyr—influence in vitro filament properties less severely, but in vivo, Ser46Phe and Ser46Tyr impair de novo filament formation. These effects of the “head” mutant proteins on endogenous intermediate filament system and their competition for binding to cellular anchoring structures might explain part of the molecular mechanism that causes disease.

Keywords

Desmin Intermediate filament protein Myofibrillar myopathy Assembly Transfection 

Notes

Acknowledgments

Harald Bär and Harald Herrmann acknowledge grants from the German Research Foundation (DFG; BA 2186/3-1 to H.B. and H.H.). Full-length cDNA of human LMNB1 cloned into the eukaryotic expression vector pEYFP-C1 was generously provided by Stephanie Geiger, DKFZ, Germany. The HL-1 cells were kindly provided by William C. Claycomb, Louisiana State University Medical Center, New Orleans, USA. We wish to thank Gloria Conover from Texas A&M University for critical reading of the manuscript.

Conflict of interest statement

The authors declare that they have no conflict of interests.

Supplementary material

109_2009_521_MOESM1_ESM.pdf (1.5 mb)
ESM 1 (PDF 243 kb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Sarika Sharma
    • 1
    • 2
  • Norbert Mücke
    • 3
  • Hugo A. Katus
    • 1
  • Harald Herrmann
    • 2
  • Harald Bär
    • 1
    • 4
  1. 1.Department of CardiologyUniversity of HeidelbergHeidelbergGermany
  2. 2.Division of Molecular GeneticsGerman Cancer Research Center (DKFZ)HeidelbergGermany
  3. 3.Division of Biophysics of MacromoleculesGerman Cancer Research Center (DKFZ)HeidelbergGermany
  4. 4.Department of CardiologyMedizinische Universitätsklinik HeidelbergHeidelbergGermany

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