Cited by 152Light effects on plantsPlant Molecular Biology ResearchPhotosynthetic Processes and Mechanisms

Blue light‐induced association of phototropin 2 with the Golgi apparatus

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Kong, Sam‐Geun, Suzuki, Tomomi, Tamura, Kentaro, Mochizuki, Nobuyoshi, Hara‐Nishimura, Ikuko, Nagatani, Akira·2006·The Plant Journal

Abstract

Summary: Phototropins 1 and 2 (phot1 and phot2) function as blue light (BL) photoreceptors for phototropism, chloroplast relocation, stomatal opening and leaf flattening in Arabidopsis thaliana . Phototropin consists of two functional domains, the N‐terminal photosensory domain and the C‐terminal Ser/Thr kinase domain. However, little is known about the signal transduction pathway that links the photoreceptors and the physiological responses downstream of BL perception. To understand the mechanisms by which phot2 initiates these responses, we transformed the phot1phot2 double mutant of Arabidopsis with constructs encoding translationally fused phot2:green fluorescent protein (P2G). P2G was fully functional for the phot2‐specific physiological responses in these transgenic plants. It localized strongly to the plasma membrane and weakly to the cytoplasm in the dark. Upon illumination with BL, punctate P2G staining was formed within a few minutes in addition to the constitutive plasma membrane staining. This punctate distribution pattern matched well with that of the Golgi‐localized KAM1ΔC:mRFP. Brefeldin A (BFA), an inhibitor of vesicle trafficking, induced accumulation of P2G around the perinuclear region even in darkness, but the punctate pattern was not observed. After treatment of these cells with BL, P2G exhibited the punctate distribution pattern that matched with that of the Golgi marker. Hence, the light‐dependent association of P2G with the Golgi apparatus was BFA‐insensitive. A structure/function analysis indicated that the kinase domain was essential for the Golgi localization of phot2. The BL‐induced Golgi localization of phot2 may be one of important signaling steps in the phot2 signal transduction pathway.

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Crossref · 10.1111/j.1365-313x.2006.02667.x

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  • Under blue light irradiation, part of PHOT1 detaches from the cell membrane and disperses in the cytoplasm, whereas some PHOT2 proteins can be coupled to the Golgi apparatus.

    “Under blue light irradiation, part of the PHOT1 protein detaches from the cell membrane and disperses in the cytoplasm, in contrast, some PHOT2 proteins can be coupled to the Golgi apparatus (Sakamoto and Briggs, 2002; Kong et al., 2006; Wan et al., 2008).”
  • Although phot1 and phot2 do not possess a transmembrane domain, they localize to the inner side of the cytoplasmic membrane in the dark.

    “Although phot1 and phot2 do not possess a transmembrane domain, they localize to the inner side of the cytoplasmic membrane in the dark (Sakamoto and Briggs, 2002; Kong et al., 2006).”

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Authors
Kong, S., Suzuki, T., Tamura, K., Mochizuki, N., Hara‐Nishimura, I., & Nagatani, A.
Affiliations
Kyoto University (JP)
Corresponding author
Nagatani, Akira
Venue
The Plant Journal
Publisher
Wiley
Published
2006-02-17
Volume
45
Issue
6
Pages
994-1005
ISSN
  • 0960-7412 (ISSN-L)
  • 1365-313X
OpenAlex
W2049111667
Cited by
152
References
50
Citations by year
2026: 1 · 2025: 2 · 2024: 6 · 2023: 1 · 2022: 7 · 2021: 7 · 2020: 8 · 2019: 4 · 2018: 7 · 2017: 1 · 2016: 10 · 2015: 9 · 2014: 14 · 2013: 10 · 2012: 14
FWCI
12.31
Type
journal article
Language
en
Open access
Locations
  • The Plant Journal (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science (13440239)
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 › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
Keywords
phototropin 2, blue-light photoreceptor, Golgi apparatus, Golgi localization, phototropism, signal transduction, kinase domain, plasma membrane, vesicle trafficking, Arabidopsis thaliana, stomatal opening
MeSH terms
Cell Membrane, Cytoplasm, Golgi Apparatus, Light, Phosphoproteins, Recombinant Fusion Proteins, Immunoblotting, Signal Transduction, Protein Serine-Threonine Kinases, Arabidopsis, Protein Structure, Tertiary, Arabidopsis Proteins, Plants, Genetically Modified

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