Journal of Applied Phycology

, Volume 25, Issue 6, pp 1887–1893 | Cite as

Changes in membrane fluidity and phospholipase D activity are required for heat activation of PyMBF1 in Pyropia yezoensis (Rhodophyta)

  • Toshiki Uji
  • Rei Sato
  • Hiroyuki Mizuta
  • Naotsune Saga


Multiprotein bridging factor 1 (MBF1) is a highly conserved transcriptional co-activator involved in the regulation of diverse processes, such as environmental stress responses. We recently identified a novel MBF1 gene, PyMBF1, from the marine red alga Pyropia yezoensis. In this study, quantitative real-time PCR analysis revealed that PyMBF1 transcripts were upregulated in P. yezoensis cells during exposure to oxidative and heat stresses. We also examined heat signaling in P. yezoensis cells by monitoring the accumulation of PyMBF1 transcripts. Heat activation of PyMBF1 was inhibited by the membrane rigidifier dimethylsulfoxide, whereas it was induced without heat stress by the membrane fluidizer benzyl alcohol (BA). Induction of PyMBF1 transcripts by heat and BA was inhibited by 1-butanol, an inhibitor of phospholipase D (PLD). The results suggest that the heat activation of PyMBF1 requires membrane fluidization and activation of PLD. These findings provide an initial step toward understanding heat signaling in marine red algae.


Heat signaling Marine macroalga Multiprotein bridging factor 1 (MBF1) Pyropia yezoensis Rhodophyta 



This study was supported in part by a grant from the Regional Innovation Cluster Program (Global Type) of the Ministry of Education, Culture, Sports, Science and Technology of Japan to N.S.


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Toshiki Uji
    • 1
  • Rei Sato
    • 1
  • Hiroyuki Mizuta
    • 1
  • Naotsune Saga
    • 1
  1. 1.Faculty of Fisheries SciencesHokkaido UniversityHakodateJapan

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