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JCS ePress online publication date 25 Jan 2005
doi: 10.1242/jcs.01642

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Research Article

Nesprin-2 is a multi-isomeric protein that binds lamin and emerin at the nuclear envelope and forms a subcellular network in skeletal muscle


Qiuping Zhang, Cassandra D. Ragnauth, Jeremy N. Skepper, Nathalie F. Worth, Derek T. Warren, Roland G. Roberts, Peter L. Weissberg, Juliet A. Ellis, and Catherine M. Shanahan*
* Author for correspondence (e-mail: cs131{at}mole.bio.cam.ac.uk)

Nesprin-2 is a multi-isomeric, modular protein composed of variable numbers of spectrin-repeats linked to a C-terminal transmembrane domain and/or to N-terminal paired calponin homology (CH) domains. The smaller isoforms of nesprin-2 co-localize with and bind lamin A and emerin at the inner nuclear envelope (NE). In SW-13 cells, which lack lamin A/C, nesprin-2 epitopes and emerin were both mislocalized and formed aggregates in the endoplasmic reticulum (ER). The larger isoforms and other CH-domain-containing isoforms co-localize with heterochromatin within the nucleus and are also present at the outer NE and in multiple cytoplasmic compartments. Nesprin-2 isoforms relocalize during in vitro muscle differentiation of C2C12 myoblasts to the sarcomere of myotubes. Immunogold electron microscopy using antibodies specific for three different epitopes detected nesprin-2 isoforms at multiple locations including intranuclear foci, both membranes of the NE, mitochondria, sarcomeric structures and plasma membrane foci. In adult skeletal muscle, confocal immunolocalization studies demonstrated that nesprin-2 epitopes were present at the Z-line and were also associated with the sarcoplasmic reticulum (SR) in close apposition to SERCA2. These data suggest that nesprin-2 isoforms form a linking network between organelles and the actin cytoskeleton and thus may be important for maintaining sub-cellular spatial organisation. Moreover, its association at the NE with lamin and emerin, the genes mutated in Emery-Dreifuss muscular dystrophy, suggests a mechanism to explain how disruption of the NE leads to muscle dysfunction.
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