An investigation of models of the IP3R channel in Xenopus oocyte.
We consider different models of inositol 1,4,5-trisphosphate (IP(3)) receptor (IP(3)R) channels in order to fit nuclear membrane patch clamp data of the stationary open probability, mean open time, and mean close time of channels in the Xenopus oocyte. Our results indicate that rather than to treat the tetrameric IP(3)R as four independent and identical subunits, one should assume sequential binding-unbinding processes of Ca(2+) ions and IP(3) messengers. Our simulations also favor the assumption that a channel opens through a conformational transition from a close state to an active state.
Shuai
J W
JW
Department of Physics, Xiamen University, Xiamen, China. jianweishuai@xmu.edu.cn
Yang
D P
DP
Pearson
J E
JE
Rüdiger
S
S
D000465:Algorithms; D000818:Animals; D001683:Biological Clocks / Q000502:physiology*; D020013:Calcium Signaling / Q000502:physiology*; D003198:Computer Simulation; D006801:Humans; D053496:Inositol 1,4,5-Trisphosphate Receptors / Q000502:physiology*; D015640:Ion Channel Gating / Q000502:physiology*; D008954:Models, Biological; D017711:Nonlinear Dynamics; D009865:Oocytes / Q000502:physiology*; D009991:Oscillometry / Q000379:methods*; D014982:Xenopus laevis / Q000502:physiology
D053496:Inositol 1,4,5-Trisphosphate Receptors