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Differential effects of ninaC proteins (p132 and p174) on light-activated currents and pupil mechanism in Drosophila photoreceptors

Published online by Cambridge University Press:  02 June 2009

Cornelia A. Hofstee ,
Stephen Henderson ,
Roger C. Hardie  and
Doekele G. Stavenga
Cornelia A. Hofstee
Affiliation:
Department of Biophysics, University of Groningen, Nijenborgh 4, NL-9747 AG, Groningen, The Netherlands
Stephen Henderson
Affiliation:
Department of Anatomy, Cambridge University, Downing St, Cambridge CB2 3DY, UK
Roger C. Hardie
Affiliation:
Department of Anatomy, Cambridge University, Downing St, Cambridge CB2 3DY, UK
Doekele G. Stavenga
Affiliation:
Department of Biophysics, University of Groningen, Nijenborgh 4, NL-9747 AG, Groningen, The Netherlands
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Abstract

The Drosophila ninaC locus encodes two retinal specific proteins (p132 and p174) both consisting of a protein kinase joined to a myosin head domain and a C terminal with a calmodulin-binding domain. The role of p132 and p174 was studied via whole-cell recording and through measurements of the pupil mechanism, i.e. the pigment migration in the photoreceptor cells, in the ninaC mutants, P[ninaCΔ132] (p132 absent), P[ninaCΔ174] (p174 absent), and ninaCp235 (null mutant). Voltage-clamped flash responses in P[ninaCΔ174] and ninaCp235 showed delayed response termination. In response to steady light, plateau responses in both P[ninaCΔ174] and ninaCp235 were also large. In both cases the defect was significantly more severe in ninaCp235. Responses in P[ninaCΔ132] were apparently normal. P[ninaCΔ174] and ninaCP235 were also characterized by spontaneous quantum bump-like activity in the dark and by larger and longer light-induced quantum bumps. The turn-off of the pupil mechanism in P\ninaCΔ174] and ninaCp235 was also defective, although in this case the rate of return to baseline in both mutants was more or less the same. In all ninaC mutants, the amplitudes of the pupillary pigment migration were distinctly smaller than that in the wild type. The reduction of the amplitude was largest in P[ninaCΔ174]. The light sensitivity of the pupil mechanism of P[ninaCΔ174] compared to that of wild type was reduced by 1.3 log units. Remarkably, the light sensitivity of P[ninaCΔ132] and ninaCP235 was ca. 0.5 log units higher than that of the wild type. The results suggest that the p174 protein is required for normal termination of the transduction cascade. The diverse phenotypes observed may suggest multiple roles for calmodulin distribution for controlling response termination and regulating pigment migration in Drosophila photoreceptors.

Keywords

FruitflyPhotoreceptorAdaptationCalciumCalmodulin
Type
Research Articles
Information
Visual Neuroscience , Volume 13 , Issue 5 , September 1996 , pp. 897 - 906
Copyright
Copyright © Cambridge University Press 1996

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