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Plant Cell Physiol. 2005 Sep;46(9):1472-6. Epub 2005 Jun 20.

A sex pheromone, protoplast release-inducing protein (PR-IP) inducer, induces sexual cell division and production of PR-IP in Closterium.

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Department of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo, 153-8902 Japan.


The sex pheromone protoplast release-inducing protein (PR-IP) inducer and a sexual cell division-inducing pheromone-minus (SCD-IP-minus) that mediates the sexual reproduction of the heterothallic Closterium peracerosum-strigosum-littorale (C. psl) complex were investigated in this study. Recombinant PR-IP inducer produced by yeast cells was prepared and assayed for production of PR-IP and induction of SCD. Both biological activities were observed after treating mating-type plus (mt+) cells with the recombinant pheromone. SCD was induced by exposure to a lower concentration of the same pheromone and by a shorter treatment period with the pheromone than was production of PR-IP. This indicates that the previously characterized PR-IP inducer has both PR-IP-inducing and SCD-inducing activities with mt+ cells, although the inducing mechanisms of the two pheromones differ.

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