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Volume 272, Number 1, Issue of January 3, 1997 pp. 486-489
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

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Heat Stress Induces a Glycosylation of Membrane Sterol in Myxoamoebae of a True Slime Mold, Physarum polycephalum

(Received for publication, July 9, 1996, and in revised form, September 17, 1996)

Kimiko Murakami-Murofushi , Keiko Nishikawa , Emi Hirakawa and Hiromu Murofushi ^¶

From the  Department of Biology, Faculty of Science, Ochanomizu University, Tokyo 112, Japan and ^¶ Department of Biophysics and Biochemistry, Faculty of Science, University of Tokyo, Tokyo 113, Japan

To know the very early events occurring after heat shock, the changes of membrane lipids were examined. Heat stress induced the production of a certain glycolipid in the myxoamoebae of Physarum polycephalum in a few minutes. The purified glycolipid was determined to be a poriferasterol monoglucoside by structural studies that was previously reported to be expressed during the differentiation of Physarum cells from haploid myxoamoebae to diploid plasmodia (Murakami-Murofushi, K., Nakamura, K., Ohta, J., Suzuki, M., Suzuki, A., Murofushi, H., and Yokota, T. (1987) J. Biol. Chem. 262, 16719-16723). The activity of UDP-glucose:poriferasterol glucosyltransferase (Murakami-Murofushi, K., and Ohta, J. (1989) Biochim. Biophys. Acta 992, 412-415) was also expressed rapidly after heat shock. Thus, the activation of sterol glucosyltransferase and the production of sterol-glucoside were considered to be important events that were involved in the signal transduction system to induce some succeeding heat-shock responses, such as the synthesis of heat-shock proteins.

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