A new type of mutation in phytochrome A causes enhanced light sensitivity and alters the degradation and subcellular partitioning of the photoreceptor

Monika Dieterle, Diana Bauer, Claudia Büche, Martina Krenz, Eberhard Schäfer, Thomas Kreisch*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)

Abstract

A specific light program consisting of multiple treatments with alternating red and far-red light pulses was used to isolate mutants in phytochrome A-dependent signal transduction pathways in Arabidopsis. Because of their phenotype, the mutants were called eid for empfindlicher im dunkelroten Licht, which means hypersensitive in far-red light. One of the isolated mutants, eid4, is a novel semi-dominant allele of the phytochrome A gene that carries a missense mutation in the chromophore-binding domain. The mutation did not change the photochemical properties of the photoreceptor, but it leads to an increased stability under light conditions that induce its rapid degradation. Fusion proteins with the green fluorescent protein exhibited clear alterations in subcellular localization of the mutated photoreceptor: The fusion protein was impaired in the formation of sequestered areas of phytochrome in the cytosol, which can explain its reduced light-dependent degradation. In contrast, the mutation stabilizes nuclear speckles (NUS) that appear late under continuous farred light, whereas the formation of early, transiently appearing NUS remained more or less unaltered.

Original languageEnglish
Pages (from-to)146-161
Number of pages16
JournalPlant Journal
Volume41
Issue number1
DOIs
Publication statusPublished - Jan 2005
Externally publishedYes

Keywords

  • Arabidopsis
  • Light signaling
  • Nuclear localization
  • Photomorphogenesis
  • Phytochrome
  • Protein degradation

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