Mechanisms of Phototransduction in Invertebrates

  • Sergej A. Shukolyukov
Chapter
Part of the Advances in Life Sciences book series (ALS)

Summary

The present state of the problem concerning the phototransductive mechanisms in the microvillar photoreceptor of some invertebrates, the phototaxic eye of unicellular algae and halophilic bacteria cells is reported.

It is noted that research of the phototransductive mechanisms in algae and bacteria is presently limited to investigations of the photocycle of the light quanta acceptor (sensory rhodopsin) and the state of its activation. So far the data on the catalytic cascade, transmitters, the signals underlying positive or negative phototactic behaviour, and the role of ions in the process are lacking.

The function of light-induced regulatory proteins including G-proteins, phospholipase C and metarhodopsin kinase in the microvillar photoreceptors is discussed. Inconsistency of the data on the role played by cGMP as the cationic conductive transmitter in the photoreceptor membrane of this type is indicated. The function of G-protein in activating phospholipase C and of inositol triphosphate in regulating the intracellular calcium concentration are revealed. The author discusses mechanisms of transition of activated metarhodopsin to the inactive state through phosphorylation by metarhodopsin kinase and of conversion of phosphorylated rhodopsin to the initial form due to dephosphorylation by Ca-dependent phosphatase.

A scheme of the possible light-activated and dark reactions in the microvillar photoreceptor of invertebrates is presented.

Keywords

Guanylate Cyclase Dark Reaction Inositol Triphosphate Photoreceptor Membrane Sensory Rhodopsin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Basel AG 1990

Authors and Affiliations

  • Sergej A. Shukolyukov
    • 1
  1. 1.Sechenov Institute of Evolutionary Physiology and Biochemistrythe USSR Academy of SciencesLeningradUSSR

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