Indo-1 derivatives for local calcium sensing.

Indo-1 derivatives for local calcium sensing.
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DOI:
10.1021/cb800258g
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发表时间:
2009-03-20
影响因子:
4
通讯作者:
Johnsson, Kai
Johnsson, Kai
中科院分区:
生物学2区
文献类型:
--
作者:
Bannwarth, Michael;Correa, Ivan R., Jr.;Sztretye, Monika;Pouvreau, Sandrine;Fellay, Cindy;Aebischer, Annina;Royer, Leandro;Ríos, Eduardo;Johnsson, Kai

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The role of calcium in signal transduction relies on the precise spatial and temporal control of its concentration. The existing means to detect fluctuations in Ca2+ concentrations with adequate temporal and spatial resolution are limited. We introduce here a method to measure Ca2+ concentrations in defined locations in living cells that is based on linking the Ca2+-sensitive dye Indo-1 to SNAP-tag fusion proteins. Fluorescence spectroscopy of SNAP-Indo-1 conjugates in vitro showed that the conjugates retained the Ca2+-sensing ability of Indo-1. In a proof-of-principle experiment, local Ca2+ sensing was demonstrated in cultured primary muscle cells of mice expressing a nucleus-localized SNAP-tag fusion. Ca2+ concentrations inside nuclei of resting cells were measured by SEER (shifted excitation and emission ratioing) of confocal microscopic images of fluorescence. After permeabilizing the plasma membrane, changes in the bathing solution induced corresponding changes in nuclear [Ca2+] that were readily detected and used for a preliminary calibration of the technique. This work thus demonstrates the synthesis and application of SNAP-tag-based Ca2+ indicators that combine the spatial specificity of genetically encoded calcium indicators with the advantageous spectroscopic properties of synthetic indicators.
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