Abstract:
:The L-type Ca2+ channel in skeletal muscle (alpha1S) is essential for excitation-contraction (EC) coupling. Previous studies using chimeras composed of alpha1S together with alpha1C or alpha1M demonstrated the importance of the alpha1S II-III loop and of a smaller subdomain (residues 720-764; 'ECC') in skeletal EC coupling. However, these chimeras failed to test the significance of regions outside the II-III loop, which are highly conserved between alpha1S and alpha1C. Therefore, we have injected dysgenic (alpha1S-lacking) myotubes with cDNAs encoding chimeras between alpha1S and the highly divergent T-type Ca2+ channel, alpha1H. The chimeras consisted of GFP-tagged alpha1H with one or more of the following substitutions: alpha1S II-III loop residues 720-764 ('ECC'), a putative targeting domain of the alpha1S C terminus ('target'; residues 1543-1662) or the entire alpha1S C terminus ('Cterm'; residues 1382-1873). The presence of either target or Cterm affected the expression and/or kinetics of whole-cell currents recorded from both dysgenic muscle cells and tsa-201 cells. Importantly, substitution of ECC alone into GFP-alpha1H (GFP-alpha1H + ECC), or together with either target (GFP-alpha1H + ECC + target) or Cterm (GFP-alpha1H + ECC + Cterm), was insufficient to restore electrically evoked contractions. Depolarization-induced fluorescence transients for GFP-alpha1H + ECC, GFP-alpha1H + ECC + target or GFP-alpha1H + ECC + Cterm had a bell shaped dependence upon membrane voltage (inconsistent with skeletal EC coupling) and were also exceedingly small (unlike cardiac EC coupling). The absence of EC coupling for these chimeras raises the possibility that regions of alpha1S outside of ECC and target are necessary for providing the context that allows these two domains to function in EC coupling and targeting, respectively. Additionally, an inadequate membrane density of the chimeras may have contributed to the lack of coupling.
journal_name
J Muscle Res Cell Motiljournal_title
Journal of muscle research and cell motilityauthors
Wilkens CM,Beam KGdoi
10.1023/a:1024830132118keywords:
subject
Has Abstractpub_date
2003-01-01 00:00:00pages
99-109issue
1eissn
0142-4319issn
1573-2657journal_volume
24pub_type
杂志文章abstract::The pattern of spontaneous skeletal muscle degeneration and clinical recovery hindlimb muscles of the mdx mutant mouse was examined for functional and metabolic confirmation of apparent structural regeneration. The contractile properties, histochemical staining and myosin light chain and parvalbumin contents of extens...
journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
doi:10.1007/BF01738755
更新日期:1988-12-01 00:00:00
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章,评审
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更新日期:2015-12-01 00:00:00
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journal_title:Journal of muscle research and cell motility
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更新日期:2004-01-01 00:00:00
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
doi:10.1007/BF00713154
更新日期:1984-02-01 00:00:00
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
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更新日期:2019-12-01 00:00:00
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
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journal_title:Journal of muscle research and cell motility
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doi:10.1007/s10974-018-9499-7
更新日期:2018-08-01 00:00:00
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
doi:10.1007/s10974-008-9137-x
更新日期:2008-01-01 00:00:00
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
doi:10.1007/BF00712309
更新日期:1985-02-01 00:00:00
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
pub_type: 杂志文章
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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journal_title:Journal of muscle research and cell motility
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