NEW ARGININE-CONTAINING PEPTIDES ISOLATED FROM CHLORELLA CELLS

概要

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Seven kinds of arginine-containing peptides were isolated from the cells of Chlorella ellipsoidea, and their structures were investigated. Their amino acid make-ups and quantities present in randomly grown algal cells were found to be as follows (in decreasing order of content in moles per dry weight of cells): Arg-Arg. Arg-Arg-Glu, Arg-Arg-Arg. Arg-Glu>Arg-(Arg_2. Glu)-Glu> Arg-(Arg_3, Glu). Arg-(Glu, Asp) Using synchronously mass-cultured algal cells the quantities of these peptides as they changed during the algal life cycle were followed. It was found that, except in the case of Arg-Arg-Arg, the contents (in moles per dry weight of cells) of the peptides (i) markedly increased during the stages from D_n to L_1, (ii) remained almost constant or more or less appreciably increased during the stages from L_1 to L_3, and (iii) decreased sharply. during the transformation of L_3-cells (via L_4) into D_n-cells in the dark. The content of Arg-Arg-Arg remained almost constant during the period from D_n to L_3, and on transference of L_4-cells in the dark it increased temporarily and then decreased during the transformation of L_4-cells into D_n-cells. Significance and possible roles of these peculiar peptides in the life cycle of Chlorella were discussed.
日本植物生理学会の論文