Abstract
In skeletal muscle, an anterograde signal from the dihydropyridine receptor (DHPR) to the ryanodine receptor (RyR1) is required for excitation-contraction (EC) coupling and a retrograde signal from RyR1 to the DHPR regulates the magnitude of the calcium current carried by the DHPR. As a tool for studying biosynthesis and targeting, we constructed a cDNA encoding green fluorescent protein (GFP) fused to the amino terminal of RyR1 and expressed it in dyspedic myotubes. The GFP-RyR1 was present in a restricted domain near the nucleus injected with cDNA and was fully functional, which places constraints on the location of the amino terminal in the folded structure of RyR1.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Animals, Newborn
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Calcium / metabolism
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Calcium / pharmacology
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Cell Nucleus / metabolism
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DNA, Complementary / metabolism
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Electrophysiology
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Green Fluorescent Proteins
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Luminescent Proteins / metabolism*
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Mice
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Models, Biological
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Muscle, Skeletal / metabolism
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Muscles / cytology
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Muscles / metabolism
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Protein Folding
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Recombinant Fusion Proteins / metabolism*
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Ryanodine Receptor Calcium Release Channel / chemistry*
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Ryanodine Receptor Calcium Release Channel / metabolism*
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Signal Transduction
Substances
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DNA, Complementary
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Luminescent Proteins
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Recombinant Fusion Proteins
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Ryanodine Receptor Calcium Release Channel
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Green Fluorescent Proteins
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Calcium