KLHL41 stabilizes skeletal muscle sarcomeres by nonproteolytic ubiquitination

Andres Ramirez-Martinez, Bercin Kutluk Cenik, Svetlana Bezprozvannaya, Beibei Chen, Rhonda Bassel-Duby, Ning Liu, Eric N. Olson

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Maintenance of muscle function requires assembly of contractile proteins into highly organized sarcomeres. Mutations in Kelch-like protein 41 (KLHL41) cause nemaline myopathy, a fatal muscle disorder associated with sarcomere disarray. We generated KLHL41 mutant mice, which display lethal disruption of sarcomeres and aberrant expression of muscle structural and contractile proteins, mimicking the hallmarks of the human disease. We show that KLHL41 is polyubiquitinated and acts, at least in part, by preventing aggregation and degradation of Nebulin, an essential component of the sarcomere. Furthermore, inhibition of KLHL41 poly-ubiquitination prevents its stabilization of nebulin, suggesting a unique role for ubiquitination in protein stabilization. These findings provide new insights into the molecular etiology of nemaline myopathy and reveal a mechanism whereby KLHL41 stabilizes sarcomeres and maintains muscle function by acting as a molecular chaperone. Similar mechanisms for protein stabilization likely contribute to the actions of other Kelch proteins.

Original languageEnglish (US)
Article numbere26439
JournaleLife
Volume6
DOIs
StatePublished - Aug 9 2017

ASJC Scopus subject areas

  • Neuroscience(all)
  • Medicine(all)
  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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