The second messenger for visual excitation in invertebrate phototransduction.
Invertebrate visual transduction involves a second messenger cascade process that leads to an increase in membrane conductance. The identity of the second messenger that gates the light-dependent channels is presently a major focus of attention. Cyclic GMP, inositol trisphosphate and Ca2+ are the most likely candidates for being such a messenger in the species studied so far. Here we review the available evidence for each of these molecules.
Bacigalupo
J
J
Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile. bacigalu@abello.dic.uchile.cl
O'Day
P M
PM
D000818:Animals; D015220:Calcium Channels / Q000502:physiology; D006152:Cyclic GMP / Q000502:physiology; D015544:Inositol 1,4,5-Trisphosphate / Q000502:physiology; D017956:Photoreceptor Cells, Invertebrate / Q000502:physiology*; D015290:Second Messenger Systems / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology*
D015220:Calcium Channels; D015544:Inositol 1,4,5-Trisphosphate; D006152:Cyclic GMP