Photochemical Gating of Intracellular Ca2+ Release Channels
摘要:
We have synthesized BiNiX, a caged methylxanthine agonist for the ryanodine receptor (RyR)the major calcium channel that mediates Ca2+ release from intracellular Ca2+ stores in electrically excitable cells. BiNiX is easily loaded into living cells through incubation with its acetoxymethyl (AM) ester. Delivery of focused UV light pulses to the loaded cell releases paraxanthine focally and rapidly to activate RyRs to release Ca2+, thus elevating intracellular Ca2+ concentration to initiate Ca2+-dependent signaling cascades. We demonstrate the biological utility of BiNiX in heart muscle cells by showing that local intracellular photolysis of BiNiX triggers Ca2+ release and consequent muscle contraction.
Photochemical Gating of Intracellular Ca2+ Release Channels
摘要:
We have synthesized BiNiX, a caged methylxanthine agonist for the ryanodine receptor (RyR)the major calcium channel that mediates Ca2+ release from intracellular Ca2+ stores in electrically excitable cells. BiNiX is easily loaded into living cells through incubation with its acetoxymethyl (AM) ester. Delivery of focused UV light pulses to the loaded cell releases paraxanthine focally and rapidly to activate RyRs to release Ca2+, thus elevating intracellular Ca2+ concentration to initiate Ca2+-dependent signaling cascades. We demonstrate the biological utility of BiNiX in heart muscle cells by showing that local intracellular photolysis of BiNiX triggers Ca2+ release and consequent muscle contraction.
Noveloptochemical tools for controllinggeneexpression in E. coli were investigated. Six photocaged carbohydrates with redshifted absorption and a photocaged salicylic acid derivative were synthesized, photochemically characterized and applied in vivo for light-mediated target geneexpression. The potential challenges during the establishment of a new optochemicallycontrollablesystem and sufficient
Effect of Photocaged Isopropyl β‐
<scp>d</scp>
‐1‐thiogalactopyranoside Solubility on the Light Responsiveness of LacI‐controlled Expression Systems in Different Bacteria
Extended toolbox: New photocaged IPTG derivatives with various hydrophobicities for light‐induced gene expression were synthesised and tested with three differentexpression host strains. The most water‐soluble compound showed superior performance, especially in Bacillus subtilis.
Photochemical Gating of Intracellular Ca<sup>2+</sup> Release Channels
作者:Jiahong Ni、Darryl A. Auston、David A. Freilich、Sukumaran Muralidharan、Eric A. Sobie、Joseph P. Y. Kao
DOI:10.1021/ja069361q
日期:2007.5.1
We have synthesized BiNiX, a caged methylxanthine agonist for the ryanodine receptor (RyR)the major calcium channel that mediates Ca2+ release from intracellular Ca2+ stores in electrically excitable cells. BiNiX is easily loaded into living cells through incubation with its acetoxymethyl (AM) ester. Delivery of focused UV light pulses to the loaded cell releases paraxanthine focally and rapidly to activate RyRs to release Ca2+, thus elevating intracellular Ca2+ concentration to initiate Ca2+-dependent signaling cascades. We demonstrate the biological utility of BiNiX in heart muscle cells by showing that local intracellular photolysis of BiNiX triggers Ca2+ release and consequent muscle contraction.