Cited by 153Light effects on plantsPhotosynthetic Processes and MechanismsPlant Molecular Biology Research

An Auxilin-Like J-Domain Protein, JAC1, Regulates Phototropin-Mediated Chloroplast Movement in Arabidopsis

Suetsugu, Noriyuki, Kagawa, Takatoshi, Wada, Masamitsu·2005·Plant Physiology

Abstract

The ambient-light conditions mediate chloroplast relocation in plant cells. Under the low-light conditions, chloroplasts accumulate in the light (accumulation response), while under the high-light conditions, they avoid the light (avoidance response). In Arabidopsis (Arabidopsis thaliana), the accumulation response is mediated by two blue-light receptors, termed phototropins (phot1 and phot2) that act redundantly, and the avoidance response is mediated by phot2 alone. A mutant, J-domain protein required for chloroplast accumulation response 1 (jac1), lacks the accumulation response under weak blue light but shows a normal avoidance response under strong blue light. In dark-adapted wild-type cells, chloroplasts accumulate on the bottom of cells. Both the jac1 and phot2 mutants are defective in this chloroplast movement in darkness. Positional cloning of JAC1 reveals that this gene encodes a J-domain protein, resembling clathrin-uncoating factor auxilin at its C terminus. The amounts of JAC1 transcripts and JAC1 proteins are not regulated by light and by phototropins. A green fluorescent protein-JAC1 fusion protein showed a similar localization pattern to green fluorescent protein alone in a transient expression assay using Arabidopsis mesophyll cells and onion (Allium cepa) epidermal cells, suggesting that the JAC1 protein may be a soluble cytosolic protein. Together, these results suggest that JAC1 is an essential component of phototropin-mediated chloroplast movement.

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  • jac1 mutants are defective in the chloroplast accumulation response, similar to rpt2 nch1 plants.

    “jac1 mutants were defective in the response to chloroplast accumulation, similar to rpt2 nch1 plants”

    From The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants (2022) · cites this paper as Suetsugu et al., 2005

    The ‘Isolation of jac1 Mutants with a New Screening Method, GBA’ section states that jac1 mutants are defective in the chloroplast accumulation response. The paper does not establish the claimed similarity to rpt2 nch1 plants; searches for those terms found no relevant passage in our copy. Page numbers were unavailable. (LLM, conf=0.85)

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  • JAC1 is necessary for the chloroplast accumulation response.

    “The accessory protein, auxin-like 6 or j-domain protein required for chloroplast accumulation response 1 (JAC1), is necessary for the chloroplast accumulation response.”

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Authors
Suetsugu, N., Kagawa, T., & Wada, M.
Affiliations
National Institute for Basic Biology (JP)
Venue
Plant Physiology
Published
2005-08-19
Volume
139
Issue
1
Pages
151-162
ISSN
  • 0032-0889 (ISSN-L)
  • 1532-2548
OpenAlex
W1992079885
Cited by
153
References
49
Citations by year
2026: 6 · 2025: 4 · 2024: 7 · 2023: 5 · 2022: 5 · 2021: 8 · 2020: 11 · 2019: 5 · 2018: 8 · 2017: 4 · 2016: 14 · 2015: 4 · 2014: 6 · 2013: 9 · 2012: 11
FWCI
7.62
Type
journal article
Language
en
Open access
closed
Locations
  • PLANT PHYSIOLOGY (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Japan Science and Technology Corporation
  • Japan Society for the Promotion of Science (13304061, 13139203, 16107002)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
Keywords
Hsp40, auxilin, phototropin, phot2, phot1, chloroplast movement, blue light signaling, Arabidopsis thaliana, positional cloning, cytosolic protein localization
MeSH terms
Amino Acid Sequence, Chloroplasts, Cloning, Molecular, Darkness, Light, Molecular Sequence Data, Movement, Mutation, Phosphoproteins, Protein Serine-Threonine Kinases, Arabidopsis, Sequence Homology, Amino Acid, Gene Expression Regulation, Plant, Plant Leaves, Arabidopsis Proteins, Auxilins

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