Artificial Flavin/Membrane Systems; a Possible Model for Physiological Blue Light Action

  • W. Schmidt
Conference paper
Part of the Proceedings in Life Sciences book series (LIFE SCIENCES)

Abstract

The blue light photoreceptor responsible for a great variety of physiological responses is most likely a flavin, bound in a highly dichroic manner to a membrane moiety [10, 11, 28]. The mechanism termed sensory transduction, by which the impinging blue light is transformed into a biochemical equivalent, appears to be a flavin-mediated photo-redox reaction. This is suggested by several observations. (1) Molecular oxygen is a necessary prerequisite for the primary blue light action [9, 21, 27]. (2) Oxidizing agents are capable of simulating physiological blue light action [26] and consequently reducing agents are capable of suppressing it [1, 26]. (3) The primary step of blue light action is temperature-independent [6, 7, 16, 20, 21]. (4) Photodynamically active dyes act as (artificial) photoreceptors, photodynamically inactive dyes do not [3, 13]. (5) Inhibitors of light-driven, flavin-mediated electron flow inhibit physiological blue light responses specifically [18, 23]. (6) The blue light-induced, dark-reversible photoreduction of a b-type cytochrome, as observed in several blue light-sensitive organisms, appears to be correlated to physiological primary reaction of blue light [19]. Redox reactions of caro-tenoids appear to be physiologically irrelevant.

Keywords

Benzene EDTA Hydrocarbon Iodide Fluores 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1980

Authors and Affiliations

  • W. Schmidt
    • 1
  1. 1.Biologisches Institut der Universität KonstanzKonstanzGermany

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