Journal
JOURNAL OF STRUCTURAL BIOLOGY
Volume 137, Issue 1-2, Pages 119-127Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jsbi.2002.4457
Keywords
nebulin; desmin; Z-line; myofibril architecture
Funding
- NHLBI NIH HHS [HL03985, HL57461] Funding Source: Medline
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R29HL057461, R01HL057461] Funding Source: NIH RePORTER
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In vertebrate skeletal muscle, ultrastructural studies have suggested that the Z-line and extracellular intermediate filaments are linked, although a structural basis for this has remained elusive. We searched for potential novel ligands of the Z-line portion of nebulin by a yeast two-hybrid (Y2H) approach. This identified that the nebulin modules M160 to M170 interact with desmin. In desmin, deletion series experiments assigned a 19-kDa central coiled-coil domain as the nebulin-binding site. The specific interactions of nebulin and desmin were confirmed in vitro by GST pull-down experiments. In situ, the nebulin modules M176 to M181 colocalize with desmin in a Z-line-associated, striated pattern as shown by immunofluorescence studies. Our data are consistent with a model that desmin attaches directly to the Z-line through its interaction with the nebulin repeats M163-M170. This interaction may link myofibrillar Z-discs to the intermediate filament system, thereby forming a lateral linkage system which contributes to maintain adjacent Z-lines in register. (C) 2002 Elsevier Science (USA).
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