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Chemical Modification of Transducin with Dansyl Chloride Hinders Its Binding to Light-activated Rhodopsin

  • Kosoy, Ana (Departamento de Quimica, Universidad Simon Bolivar) ;
  • Moller, Carolina (Departamento de Quimica, Universidad Simon Bolivar) ;
  • Perdomo, Deisy (Departamento de Biologia Celular, Universidad Simon Bolivar) ;
  • Bubis, Jose (Departamento de Biologia Celular, Universidad Simon Bolivar)
  • Published : 2004.03.31
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Abstract

Transducin (T), the heterotrimeric guanine nucleotide binding protein in rod outer segments, serves as an intermediary between the receptor protein, rhodopsin, and the effector protein, cGMP phosphodiesterase. Labeling of T with dansyl chloride (DnsCl) inhibited its light-dependent guanine nucleotide binding activity. Conversely, DnsCl had no effect on the functionality of rhodopsin. Approximately 2-3 mol of DnsCl were incorporated per mole of T. Since fluoroaluminate was capable of activating DnsCl-modified T, this lysine-specific labeling compound did not affect the guanine nucleotide-binding pocket of T. However, the labeling of T with DnsCl hindered its binding to photoexcited rhodopsin, as shown by sedimentation experiments. Additionally, rhodopsin completely protected against the DnsCl inactivation of T. These results demonstrated the existence of functional lysines on T that are located in the proximity of the interaction site with the photoreceptor protein.

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