TY  - JOUR
A1  - Lange, Stephan
A1  - Himmel, Mirko
A1  - Auerbach, Daniel
A1  - Agarkova, Irina
A1  - Hayess, Katrin
A1  - Fürst, Dieter Oswald
A1  - Perriard, Jean-Claude
A1  - Ehler, Elisabeth
T1  - Dimerisation of myomesin : implications for the structure of the sarcomeric M-band
N2  - The sarcomeric M-band is thought to provide a link between the thick and the elastic, filament systems. So far, relatively little is known about its structural components and their three-dimensional organisation. Myomesin seems to be an essential component of the M-band, since it is expressed in all types of vertebrate striated muscle fibres investigated and can be found in its mature localisation pattern as soon as the first myofibrils are assembled. Previous work has shown that the N-terminal and central part of myomesin harbour binding sites for myosin, titin and muscle creatine kinase. Intrigued by the highly conserved domain layout of the C-terminal half, we screened for new interaction partners by yeast two-hybrid analysis. This revealed a strong interaction of myomesin with itself. This finding was confirmed by several biochemical assays. Our data suggest that myomesin can form antiparallel dimers via a binding site residing in its C-terminal domain 13. We suggest that, similar to alpha-actinin in the Z-disc, the myomesin dimers cross- link the contractile filaments in the M-band. The new and the already previously identified myomesin interaction sites are integrated into the first three-dimensional model of the sarcomeric M-band on a molecular basis. (C) 2004 Elsevier Ltd. All rights reserved
Y1  - 2005
SN  - 0022-2836
ER  - 
TY  - JOUR
A1  - Gehmlich, Katja
A1  - Hayess, Katrin
A1  - Legler, Christof
A1  - Haebel, Sophie
A1  - van der Ven, Peter F. M.
A1  - Ehler, Elisabeth
A1  - Fuerst, Dieter O.
T1  - Ponsin interacts with Nck adapter proteins : implications for a role in cytoskeletal remodelling during differentiation of skeletal muscle cells
N2  - Skeletal muscle differentiation is a complex process: It is characterised by changes in gene expression and protein composition. Simultaneously, a dramatic remodelling of the cytoskeleton and associated cell-matrix contacts, the costameres, occurs. The expression and localisation of the protein ponsin at cell-matrix contacts marks the establishment of costameres. In this report we show that skeletal muscle cells are characterised by a novel ponsin isoform, which contains a large insertion in its carboxy-terminus. This skeletal muscle-specific module binds the adapter proteins Nck1 and Nck2, and increased co-localisation of ponsin with Nck2 is observed at remodelling cell-matrix contacts of differentiating skeletal muscle cells. Since this ponsin insertion can be phosphorylated, it may adjust the interaction affinity with Nck adapter proteins. The novel ponsin isoform and its interaction with Nck1/2 provide exciting insight into the convergence of signalling pathways at the costameres, and its crucial role for skeletal muscle differentiation and re-generation.
Y1  - 2010
UR  - http://www.sciencedirect.com/science/journal/01719335
U6  - https://doi.org/10.1016/j.ejcb.2009.10.019
SN  - 0171-9335
ER  -