Activation of the bovine retinal rod outer segment cGMP-specific phosphodiesterase by the transducin-GTP[S] complex in a physiologically significant range of free calcium ion concentrations

  • O. V. Petrukhin
  • T. G. Orlova
  • A. R. Nezvetsky
  • N. Ya. Orlov
Short Communications


The basal- and GTP[S]-stimulated activities of cGMP-specific phosphodiesterase were measured in totally bleached bovine retinal rod outer segments suspensions at high and low free calcium ions concentration (≈100 μM and <10 nM, respectively). The obtained results suggest that the activity of free phosphodiesterase in rod outer segment membranes and all following processes (transducin activation, interaction transducin-GTP[S] complex with phosphodiesterase, and activity of the enzyme stimulated by transducin-GTP[S] complex) do not depend on the concentration of free calcium ions in a physiologically significant range of its concentration changes in rod outer segments.


photoreceptor phosphodiesterase transducin-induced activation calcium ions 


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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • O. V. Petrukhin
    • 1
  • T. G. Orlova
    • 1
  • A. R. Nezvetsky
    • 1
  • N. Ya. Orlov
    • 1
  1. 1.Institute of Theoretical and Experimental BiophysicsRussian Academy of SciencesPushchino, Moscow oblastRussia

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