Ca2+ indicators based on computationally redesigned calmodulin-peptide pairs. Journal Article uri icon



  • The binding interface of calmodulin and a calmodulin binding peptide were reengineered by computationally designing complementary bumps and holes. This redesign led to the development of sensitive and specific pairs of mutant proteins used to sense Ca(2+) in a second generation of genetically encoded Ca(2+) indicators (cameleons). These cameleons are no longer perturbed by large excesses of native calmodulin, and they display Ca(2+) sensitivities tuned over a 100-fold range (0.6-160 microM). Incorporation of circularly permuted Venus in place of Citrine results in a 3- to 5-fold increase in the dynamic range. These redesigned cameleons show significant improvements over previous versions in theability to monitor Ca(2+) in the cytoplasm as well as distinct subcellular localizations, such as the plasma membrane of neurons and the mitochondria.

publication date

  • January 1, 2006

Date in CU Experts

  • October 1, 2013 11:34 AM

Full Author List

  • Palmer AE; Giacomello M; Kortemme T; Hires SA; Lev-Ram V; Baker D; Tsien RY

author count

  • 7

Additional Document Info

start page

  • 521-30

end page

  • 521-30


  • 13


  • 5