Abstract
4-Chloro-m-cresol (4-CmC) is a potent and specific activator of the intracellular Ca2+ release channel, the ryanodine receptor (RyR). We have previously shown that RyR1 expressed in dyspedic 1B5 myotubes is activated by 4-CmC, whereas RyR3 is not (Fessenden, J. D., Wang, Y., Moore, R. A., Chen, S. R. W., Allen, P. D., and Pessah, I. N. (2000) Biophys. J. 79, 2509-2525). To identify region(s) on RyR1 that are responsible for mediating activation by 4-CmC, we expressed RyR1-RyR3 chimeric proteins in dyspedic 1B5 myotubes and then measured 4-CmC-induced increases in intracellular Ca2+. Substitution of the C-terminal third of RyR1 into RyR3 imparted 4-CmC sensitivity to the resulting chimera, thus suggesting that determinants required for activation by 4-CmC are located in this region. We subdivided the C-terminal third of RyR1 into smaller segments and identified two overlapping regions of RyR1 (amino acids 3769-4180 and 4007-4382) that each imparted 4-CmC sensitivity to RyR3. Substitution of the 173 amino acids of RyR1 common to these two chimeras (amino acids 4007-4180) also weakly restored 4-CmC sensitivity in the resulting chimera. To confirm these findings, we created a complementary set of chimeras containing RyR3 substituti...Continue Reading
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