Journal
JOURNAL OF CELL SCIENCE
Volume 122, Issue 15, Pages 2640-2650Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.046193
Keywords
Ankyrin; Knockout; Muscular dystrophy; Nedd8; Obscurin; Sarcoplasmic reticulum
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Funding
- NIH
- MDA
- AHA
- VA Center
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The giant protein obscurin is thought to link the sarcomere with the sarcoplasmic reticulum (SR). The N-terminus of obscurin interacts with the M-band proteins titin and myomesin, whereas the C-terminus mediates interactions with ankyrin proteins. Here, we investigate the importance of obscurin for SR architecture and organization. Lack of obscurin in cross-striated muscles leads to changes in longitudinal SR architecture and disruption of small ankyrin-1.5 (sAnk1.5) expression and localization. Changes in SR architecture in obscurin knockout mice are also associated with alterations in several SR or SR-associated proteins, such as ankyrin-2 and beta-spectrin. Finally, obscurin knockout mice display centralized nuclei in skeletal muscles as a sign of mild myopathy, but have normal sarcomeric structure and preserved muscle function. Journal of Cell Science
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