Measuring the in situ Kd of a genetically encoded Ca2+ sensor. Journal Article uri icon



  • The use of genetically encoded Ca(2+) sensors (GECIs) for long-term monitoring of intracellular Ca(2+) has become increasingly common in the last decade. Emission-ratiometric GECIs, such as those in the Yellow Cameleon family, can be used to make quantitative measurements, meaning that their fluorescence signals can be converted to free Ca(2+) concentrations ([Ca(2+)]free). This conversion is only as accurate as the sensor's apparent dissociation constant for Ca(2+) (K'd), which depends on temperature, pH, and salt concentration. This protocol describes a method for performing a titration, in living cells (in situ), of cytosolic, nuclear, or mitochondrial sensors.

publication date

  • January 5, 2015

has subject area

has restriction

  • green

Date in CU Experts

  • January 26, 2015 11:17 AM

Full Author List

  • Park JG; Palmer AE

author count

  • 2

Other Profiles

Electronic International Standard Serial Number (EISSN)

  • 1559-6095

Additional Document Info

start page

  • pdb.prot076554


  • 2015


  • 1