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Research ArticleCELL BIOLOGY AND SIGNAL TRANSDUCTION
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An Auxilin-Like J-Domain Protein, JAC1, Regulates Phototropin-Mediated Chloroplast Movement in Arabidopsis

Noriyuki Suetsugu, Takatoshi Kagawa, Masamitsu Wada
Noriyuki Suetsugu
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Takatoshi Kagawa
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Masamitsu Wada
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Published September 2005. DOI: https://doi.org/10.1104/pp.105.067371

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  • © 2005 American Society of Plant Biologists

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.

  • Received June 20, 2005.
  • Revised July 11, 2005.
  • Accepted July 14, 2005.
  • Published August 19, 2005.
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An Auxilin-Like J-Domain Protein, JAC1, Regulates Phototropin-Mediated Chloroplast Movement in Arabidopsis
Noriyuki Suetsugu, Takatoshi Kagawa, Masamitsu Wada
Plant Physiology Sep 2005, 139 (1) 151-162; DOI: 10.1104/pp.105.067371

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An Auxilin-Like J-Domain Protein, JAC1, Regulates Phototropin-Mediated Chloroplast Movement in Arabidopsis
Noriyuki Suetsugu, Takatoshi Kagawa, Masamitsu Wada
Plant Physiology Sep 2005, 139 (1) 151-162; DOI: 10.1104/pp.105.067371
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Plant Physiology: 139 (1)
Plant Physiology
Vol. 139, Issue 1
September 2005
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