Molecular interactions with obscurin are involved in the localization of muscle-specific small ankyrin1 isoforms to subcompartments of the sarcoplasmic reticulum

被引:47
作者
Armani, Andrea
Galli, Sara
Giacomello, Emiliana
Bagnato, Paola
Barone, Virginia
Rossi, Daniela
Sorrentino, Vincenzo [1 ]
机构
[1] Univ Siena, Dept Neurosci, Mol Med Sect, I-53100 Siena, Italy
[2] Ist Sci San Raffaele, DIBIT, Milan, Italy
[3] Interuniv Inst Myol, Milan, Italy
关键词
sarcoplasmic reticulum; ankyrin; cytoskeleton; calcium stores; striated muscle;
D O I
10.1016/j.yexcr.2006.07.027
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
We report here on experiments aimed to characterise the molecular basis of the interactions between muscle-specific ankyrin1 isoforms localized on the sarcoplasmic reticulum and obscurin a protein associated with the contractile apparatus. A novel small muscle-specific ankyrin isoform, ank1.9 was identified that, similarly to the known ank1.5 isoform, was able to bind to obscurin in yeast two-hybrid assay and in pull-down experiments. Two distinct binding sites in the C-terminus of obscurin were found to mediate binding with ank1.5 and ank1.9. Interactions between ank1.5 and ank1.9 with recombinant proteins containing one or two of the binding sites of obscurin were confirmed by expressing recombinant proteins in NIH3T3 cells. In cultured myotubes, ank1.5 and ank1.9 colocalized with endogenous obscurin at the M-band region. In contrast with evidence of efficient binding between small ank1 isoforms and obscurin, in vitro interaction studies and transfection experiments in myotubes indicated that small ank1 isoforms do not efficiently interact with titin. Altogether, these results support a role of obscurin in mediating the subcellular localization of small ank1 isoforms in striated muscle cells. Given that the localization of small muscle-specific ank1 isoforms mirrors that of obscurin, we propose that obscurin and small ank1 isoforms may form stable interactions that may be relevant to connect the sarcoplasmic reticulum and the contractile apparatus in skeletal muscle cells. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:3546 / 3558
页数:13
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