18 research outputs found
A negative screen for mutations in calstabin 1 and 2 genes in patients with dilated cardiomyopathy
<p>Abstract</p> <p>Background</p> <p>Calstabins 1 and 2 bind to Ryanodine receptors regulating muscle excitation-contraction coupling. Mutations in Ryanodine receptors affecting their interaction with calstabins lead to different cardiac pathologies. Animal studies suggest the involvement of calstabins with dilated cardiomyopathy.</p> <p>Results</p> <p>We tested the hypothesis that calstabins mutations may cause dilated cardiomyopathy in humans screening 186 patients with idiopathic dilated cardiomyopathy for genetic alterations in calstabins 1 and 2 genes (<it>FKBP12 </it>and <it>FKBP12.6)</it>. No missense variant was found. Five no-coding variations were found but not related to the disease.</p> <p>Conclusions</p> <p>These data corroborate other studies suggesting that mutations in <it>FKBP12 </it>and <it>FKBP12.6 </it>genes are not commonly related to cardiac diseases.</p
CLIC2-RyR1 Interaction and Structural Characterization by Cryo-electron Microscopy
Chloride intracellular channel 2 (CLIC2), a newly discovered small protein
distantly related to the glutathione transferase (GST) structural family, is
highly expressed in cardiac and skeletal muscle, although its physiological
function in these tissues has not been established. In the present study, [3H]
ryanodine binding, Ca2+ efflux from skeletal sarcoplasmic reticulum (SR)
vesicles, single channel recording, and cryo-electron microscopy were
employed to investigate whether CLIC2 can interact with skeletal
ryanodine receptor (RyR1) and modulate its channel activity. We found
that: (1) CLIC2 facilitated [3H]ryanodine binding to skeletal SR and purified
RyR1, by increasing the binding affinity of ryanodine for its receptor
without significantly changing the apparent maximal binding capacity; (2)
CLIC2 reduced the maximal Ca2+ efflux rate from skeletal SR vesicles; (3)
CLIC2 decreased the open probability of RyR1 channel, through increasing
the mean closed time of the channel; (4) CLIC2 bound to a region between
domains 5 and 6 in the clamp-shaped region of RyR1; (5) and in the same
clamp region, domains 9 and 10 became separated after CLIC2 binding,
indicating CLIC2 induced a conformational change of RyR1. These data
suggest that CLIC2 can interact with RyR1 and modulate its channel
activity. We propose that CLIC2 functions as an intrinsic stabilizer of the
closed state of RyR channels