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Plant and Cell Physiology, 1965, Vol. 6, No. 4 631-643
© 1965

Article

NEW ARGININE-CONTAINING PEPTIDES ISOLATED FROM CHLORELLA CELLS

TAMOTSU KANAZAWA, KIMIKO KANAZAWA and YUJI MORIMURA

Tokugawa Institute for Biological Research Tokyo

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 contentin moles per dry weight of cells):

Arg-Arg, Arg-Arg-Glu, Arg-Arg-Arg, Arg-Glu> Arg-(Arg2, Glu)-Glu>Arg-(Arg3, 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 Dn to L1, (ii) remained almost constant or more or less appreciably increased during the stages from L1 to L3, and (iii) decreased sharply during the transformation of L3-cells (via L4) into Dn-cells in the dark. The content of Arg-Arg-Arg remained almost constant during the period from Dn to L3, and on transference of L3-cells in the dark it increased temporarily and then decreased during the transformation of L4-cells into Dn-cells. Significance and possible roles of these peculiar peptides in the life cycle of Chlorella were discussed.

(Received May 10, 1965; )
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