Phototropin perceives temperature based on the lifetime of its photoactivated state

Living organisms detect changes in temperature using thermosensory molecules. However, these molecules and/or their mechanisms for sensing temperature differ among organisms. To identify thermosensory molecules in plants, we investigated chloroplast positioning in response to temperature changes and...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2017-08, Vol.114 (34), p.9206-9211
Main Authors: Fujii, Yuta, Tanaka, Hiroyuki, Konno, Naotake, Ogasawara, Yuka, Hamashima, Noriko, Tamura, Saori, Hasegawa, Satoshi, Hayasaki, Yoshio, Okajima, Koji, Kodama, Yutaka
Format: Article
Language:English
Subjects:
Biological Sciences
Change detection
Chloroplasts
Chloroplasts - genetics
Chloroplasts - metabolism
Chloroplasts - radiation effects
Flowers & plants
Hepatophyta - genetics
Hepatophyta - metabolism
Hepatophyta - radiation effects
Light
Light effects
Organisms
Photoreception
Photoreceptors
Photosynthesis
Phototropins - genetics
Phototropins - metabolism
Plant Proteins - genetics
Plant Proteins - metabolism
Plants (botany)
Sensors
Studies
Temperature
Temperature effects
Thermoreceptors
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Summary:Living organisms detect changes in temperature using thermosensory molecules. However, these molecules and/or their mechanisms for sensing temperature differ among organisms. To identify thermosensory molecules in plants, we investigated chloroplast positioning in response to temperature changes and identified a blue-light photoreceptor, phototropin, that is an essential regulator of chloroplast positioning. Based on the biochemical properties of phototropin during the cellular response to light and temperature changes, we found that phototropin perceives temperature based on the temperature-dependent lifetime of the photoactivated chromophore. Our findings indicate that phototropin perceives both blue light and temperature and uses this information to arrange the chloroplasts for optimal photosynthesis. Because the photoactivated chromophore of many photoreceptors has a temperature-dependent lifetime, a similar temperature-sensing mechanism likely exists in other organisms. Thus, photoreceptors may have the potential to function as thermoreceptors.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1704462114