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- W2039697219 abstract "Triadin in the junctional sarcoplasmic reticulum (SR) of skeletal muscle cells has been suggested to interact with ryanodine receptor 1 (RYR1) via its KEKE motifs. Recently, we showed that amino acid residues D4878, D4907, and E4908 in RYR1 are critical for triadin-binding in vitro [J.M. Lee, S.H. Rho, D.W. Shin, C. Cho, W.J. Park, S.H. Eom, J. Ma, D.H. Kim, Negatively charged amino acids within the intraluminal loop of ryanodine receptor are involved in the interaction with triadin, J. Biol. Chem. 279 (2004) 6994-7000]. In order to test whether a disruption of the triadin-binding site(s) in RYR1 affects SR Ca(2+) release, alanine-substituted single (D4878A, D4907A, and E4908A) and triple (RYR1-TM) mutants of D4878, D4907, and E4908 were expressed in RYR1-null myotubes. Co-immunoprecipitation experiments showed a 50-60% decrease of triadin brought down in the D4907A and RYR1-TM complexes compared to the triadin-wtRYR1 complex. Ca(2+) imaging experiments using Fluo-4-AM showed atypical caffeine responses in myotubes expressing D4907A and RYR1-TM characterized by either a lack of or slower activation and faster inactivation of Ca(2+) transients. The results suggest that disruption of interaction between triadin and RYR1 impairs RYR1 function and SR Ca(2+) release." @default.
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- W2039697219 date "2006-12-01" @default.
- W2039697219 modified "2023-10-15" @default.
- W2039697219 title "Occurrence of atypical Ca2+ transients in triadin-binding deficient-RYR1 mutants" @default.
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- W2039697219 doi "https://doi.org/10.1016/j.bbrc.2006.10.115" @default.
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