title: An allosteric model of the inositol trisphosphate receptor with nonequilibrium binding.
abstract: The inositol trisphosphate receptor (IPR) is a crucial ion channel that regulates the Ca(2+) influx from the endoplasmic reticulum (ER) to the cytoplasm. A thorough study of the IPR channel contributes to a better understanding of calcium oscillations and waves. It has long been observed that the IPR channel is a typical biological system which performs adaptation. However, recent advances on the physical essence of adaptation show that adaptation systems with a negative feedback mechanism, such as the IPR channel, must break detailed balance and always operate out of equilibrium with energy dissipation. Almost all previous IPR models are equilibrium models assuming detailed balance and thus violate the dissipative nature of adaptation. In this article, we constructed a nonequilibrium allosteric model of single IPR channels based on the patch-clamp experimental data obtained from the IPR in the outer membranes of isolated nuclei of the Xenopus oocyte. It turns out that our model reproduces the patch-clamp experimental data reasonably well and produces both the correct steady-state and dynamic properties of the channel. Particularly, our model successfully describes the complicated bimodal [Ca(2+)] dependence of the mean open duration at high [IP3], a steady-state behavior which fails to be correctly described in previous IPR models. Finally, we used the patch-clamp experimental data to validate that the IPR channel indeed breaks detailed balance and thus is a nonequilibrium system which consumes energy.
authors.affiliation: LMAM, School of Mathematical Sciences, Peking University, Beijing 100871, People's Republic of China. Beijing International Center for Mathematical Research, Beijing 100871, People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Jia
authors.forename: Daquan
authors.initials: D
authors.lastname: Jiang
authors.forename: Minping
authors.initials: M
authors.lastname: Qian
mesh_terms: D000495:Allosteric Site; D000818:Animals; D002118:Calcium / Q000502:physiology*; D002467:Cell Nucleus / Q000737:chemistry; D003198:Computer Simulation; D005260:Female; D053496:Inositol 1,4,5-Trisphosphate Receptors / Q000737:chemistry* / Q000502:physiology; D008954:Models, Biological; D009865:Oocytes / Q000502:physiology; D018408:Patch-Clamp Techniques; D021122:Protein Subunits / Q000737:chemistry / Q000502:physiology; D014981:Xenopus
chemical_list: D053496:Inositol 1,4,5-Trisphosphate Receptors; D021122:Protein Subunits; D002118:Calcium