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Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

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Channel Rhodopsins01:11

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G-Protein Gated Ion Channels01:21

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Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

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Electrophysiological Method for Whole-cell Voltage Clamp Recordings from Drosophila Photoreceptors
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Structural basis of a phototropin light switch.

Shannon M Harper1, Lori C Neil, Kevin H Gardner

  • 1Departments of Biochemistry and Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9038, USA.

Science (New York, N.Y.)
|September 13, 2003
PubMed
Summary

Phototropins use blue light to activate plant signaling. A newly identified helix outside the sensory domain shifts during light activation, coupling light-sensing to kinase activity.

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Area of Science:

  • Plant biology
  • Molecular biology
  • Biochemistry

Background:

  • Phototropins are crucial blue-light photoreceptors in plants.
  • Light triggers signaling via a covalent protein-flavin mononucleotide (FMN) adduct in Per-ARNT-Sim (PAS) domains.
  • Understanding phototropin activation mechanisms is key to plant photobiology.

Purpose of the Study:

  • To characterize light-dependent structural changes in a phototropin PAS domain.
  • To elucidate the role of external structural elements in phototropin activation.
  • To identify conserved signaling pathways within PAS domains.

Main Methods:

  • Solution nuclear magnetic resonance (NMR) spectroscopy was employed.
  • The study focused on a specific phototropin PAS domain.
  • Light-induced structural dynamics were analyzed.

Main Results:

  • A key alpha helix outside the canonical PAS domain was identified.
  • This helix associates with the PAS core in the dark state.
  • Photoactivation disrupts the helix-PAS core interaction, indicating a structural rearrangement.
  • Light-induced FMN adduct formation is linked to these structural changes.

Conclusions:

  • The external helix acts as a critical component in phototropin light activation.
  • The proposed mechanism couples light-dependent covalent bond formation to kinase activation.
  • This signaling pathway involving structural rearrangement is potentially conserved across PAS domains.
  • Findings provide new insights into blue-light signaling in plants.