Rhodopsin in Cell Membranes and the Process of Phototransduction

  • M. Montal
  • J. I. Korenbrot
Chapter

Abstract

Photoreceptor cells in both vertebrate and invertebrate species are capable of responding electrically to the absorption of single quanta of light. Considerable effort has been directed to the understanding of the molecular mechanisms which could lead to such high sensitivity of the photoreceptors. Membrane-bound visual pigments, like rhodopsin, can absorb single quanta of light and initiate the electrophysiological response in the photoreceptors. The purpose of the present chapter is to analyze the information now available on the mechanism of coupling between the light-induced changes of the visual pigments and the electrical events in the photoreceptor cell, that is, the mechanisms of phototransduction. We will sacrifice in-depth discussion of the biochemical properties of the visual pigment and of the electrophysiological properties of the photoreceptors, which can be found separately in excellent recent reviews (Tomita, 1970; Hagins, 1972; Kropf, 1972; Fuortes and O’Bryan, 1972a,b; Daemen, 1973; Abrahamson and Fager, 1973), for the breadth of background which we consider important in order to bring both areas into a single discussion of phototransduction.

Keywords

Outer Segment Visual Pigment Internal Transmitter Photoreceptor Membrane Visual Excitation 
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Copyright information

© Springer Science+Business Media New York 1976

Authors and Affiliations

  • M. Montal
    • 1
  • J. I. Korenbrot
    • 2
  1. 1.Centro de Investigación y de Estudios AvanzadosInstituto Politécnico NacionalMéxico, 14, D.F.Mexico
  2. 2.Departments of Physiology and Biochemistry, School of MedicineUniversity of CaliforniaSan FranciscoUSA

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