Cited by 937Light effects on plantsPlant Molecular Biology ResearchPhotoreceptor and optogenetics research

Phototropin Blue-Light Receptors

Christie, John M.·2007·Annual Review of Plant Biology

Abstract

Phototropins are blue-light receptors controlling a range of responses that serve to optimize the photosynthetic efficiency of plants. These include phototropism, light-induced stomatal opening, and chloroplast movements in response to changes in light intensity. Since the isolation of the Arabidopsis PHOT1 gene in 1997, phototropins have been identified in ferns and mosses where their physiological functions appear to be conserved. Arabidopsis contains two phototropins, phot1 and phot2, that exhibit overlapping functions in addition to having unique physiological roles. Phototropins are light-activated serine/threonine protein kinases. Light sensing by the phototropins is mediated by a repeated motif at the N-terminal region of the protein known as the LOV domain. Photoexcitation of the LOV domain results in receptor autophosphorylation and an initiation of phototropin signaling. Here we summarize the photochemical and biochemical events underlying phototropin activation in addition to the current knowledge of the molecular mechanisms associated with photoreceptor signaling.

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Crossref · 10.1146/annurev.arplant.58.032806.103951

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  • Phototropins are composed of approximately 1000 amino acids and two FMN domains, with an N-terminus containing two repeating conserved sequences LOV1 and LOV2, and a C-terminus STK domain that interconnects with LOV2.

    “Phototropins are composed of approximately 1000 amino acids and two flavin mononucleotides (FMN) domain, and their N-terminus contains two repeating conserved sequences, LOV1 and LOV2. The C-terminus of phototropin is a serine/threonine kinase domain (STK) that interconnects with LOV2 (Christie, 2007; Okajima, 2016).”
  • Phototropins (PHOT1 and PHOT2) act as photoreceptors in plants and respond to environmental conditions by regulating phototropism, chloroplast movement, stomatal opening and leaf extension.

    “Phototropins (PHOT1 and PHOT2) act as photoreceptors in plants and respond to environmental conditions by regulating phototropism, chloroplast movement, stomatal opening and leaf extension (Christie, 2007).”
  • The chloroplast accumulation response ensures efficient photosynthesis and biomass production under a wide range of light intensities.

    “ensuring efficient photosynthesis and biomass production under a wide range of light intensities”
  • Chloroplasts travel toward low-fluence blue light and aggregate along the oblique perimeter wall, which is the accumulation response.

    “chloroplasts travel toward low-fluence blue light and aggregate along the oblique perimeter wall (accumulation response)”
  • Blue light is the primary light that induces chloroplast movement to optimize light uptake.

    “Blue light is the primary light that induces chloroplast movement to optimize light uptake”

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Authors
Christie, J. M.
Affiliations
University of Glasgow (GB)
Corresponding author
Christie, John M.
Venue
Annual Review of Plant Biology
Published
2007-06-01
Volume
58
Issue
1
Pages
21-45
ISSN
  • 1543-5008 (ISSN-L)
  • 1545-2123
OpenAlex
W2121122292
Cited by
937
References
165
Citations by year
2026: 42 · 2025: 54 · 2024: 51 · 2023: 42 · 2022: 50 · 2021: 45 · 2020: 80 · 2019: 69 · 2018: 52 · 2017: 39 · 2016: 40 · 2015: 41 · 2014: 49 · 2013: 55 · 2012: 59
FWCI
2.05
Type
journal article
Language
en
Open access
closed
Locations
  • Annual Review of Plant Biology (publishedVersion)
  • PubMed (publishedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (submittedVersion)
Funders
Biotechnology and Biological Sciences Research Council (BB/C000366/1)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Photoreceptor and optogenetics research
Keywords
phototropin, blue light receptor, phototropism, stomatal opening, chloroplast movement, LOV domain, ferns, bryophytes, plant photoreceptors
MeSH terms
Calcium, Chloroplasts, Models, Molecular, Phosphorylation, Plant Proteins, Plants, Signal Transduction, Protein Serine-Threonine Kinases, Protein Structure, Tertiary, Phototropism, Hypocotyl, Photosynthetic Reaction Center Complex Proteins, Plant Development

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