Concentric intermediate filament lattice links to specialized Z-band junctional complexes in sonic muscle fibers of the type I male midshipman fish

Michael K. Lewis, Patrick C. Nahirney, Victor Chen, Bishow B. Adhikari, John Wright, Michael K. Reedy, Andrew H. Bass, Kuan Wang

研究成果: 雜誌貢獻文章同行評審

21 引文 斯高帕斯(Scopus)

摘要

Type I male midshipman fish produce high-frequency hums for prolonged durations using sonic muscle fibers, each of which contains a hollow tube of radially oriented thin and flat myofibrils that display extraordinarily wide (∼1.2μm) Z bands. We have revealed an elaborate cytoskeletal network of desmin filaments associated with the contractile cylinder that form interconnected concentric ring structures in the core and periphery at the level of the Z bands. Stretch and release of single fibers revealed reversible length changes in the elastic desmin lattice. This lattice is linked to Z bands via novel intracellular desmosome-like junctional complexes that collectively form a ring, termed the "Z corset," around the periphery and within the core of the cylinder. The junctional complex consists of regularly spaced parallel ∼900-nm-long cytoskeletal rods, or "Z bars," interconnected with slender (3-4nm) plectin-positive filaments. Z bars are linked to the Z band by plectin filaments and on the opposite side to a dense mesh of desmin filaments. Adjacent Z bands are linked by slender filaments that appear to suspend sarcotubules. We propose that the highly reinforced elastic desmin cytoskeleton and the unique Z band junctions are structural adaptations that enable the muscles' high-frequency and high-endurance activity.

原文英語
頁(從 - 到)56-71
頁數16
期刊Journal of Structural Biology
143
發行號1
DOIs
出版狀態已發佈 - 七月 1 2003
對外發佈

ASJC Scopus subject areas

  • 結構生物學

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