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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2003.1
- 수록면
- 66 - 66 (1page)
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초록· 키워드
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In skeletal muscle cells, depolarization of the transverse tubules (T-tubules) results in Ca$\^$2+/ release from the sarcoplasmic reticulum (SR), leading to elevated cytoplasmic Ca$\^$2+/ and muscle contraction. This process has been known as excitation-contraction coupling (E-C coupling). Several proteins, such as the ryanodine receptor (RyR), triadin, junctin, and calsequestrin (CSQ), have been identified to be involved in the Ca$\^$2＋/ release process. However, the molecular interactions between the SR proteins have not been resolved. In the present study, the mechanisms of interaction between RyRl and triadin have been studied by in vitro protein binding and $\^$45/Ca$\^$2+/ overlay assays. Our data demonstrate that the intraluminal loop II of RyR1 binds to triadin in Ca$\^$2+/-independent manner. Moreover, we could not find any Ca$\^$2+/ binding sites in the loop II region. GST-pull down assay revealed that a KEKE motif of triadin, which was previously identified as a CSQ binding site (Kobayasi et al.,2000 JBC) was also a binding site for RyR1. Our results suggest that the intraluminal loop II of RyR could participate in the RyR-mediated Ca$\^$2+/ release process by offering a direct binding site to luminal triadin.
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