Several 4-Substituted Glutamic Acid Derivatives and Small Peptides in Some Liliaceae Plants

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概要

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• Acidic non-protein amino acids and peptides in five species belonging to the family Liliaceae -Smilax china, Lilium maximowiczii, Tulipa gesneriana, Allium cepa and A. sativum- were surveyed. Two new amino acids -4-hydroxymethyl- and 4-ethyl-4-hydroxyglutamic acid- were isolated from bulbs of T. gesneriana. The first unequivocal identification of 4-ethylglutamic acid was performed from the same plant tissue. A new dipeptide -S-(2-carboxy-n-propyl)cysteinyl glycine- was isolated from A. cepa. Besides the compounds described above, 4-methylene-, 4- methyl- and 4-hydroxy-4-methylglutamic acid were isolated from S. china, L. maximowiczii, and T. gesneriana, but 4-ethylideneglutamic acid was isolated only from T. gesneriana. 4- Methyleneglutamic acid showed no appreciable biological activity, although this amino acid has an α, β-unsaturated carboxyl group and reacts easily with cysteine in vitro. The most abundant free amino acid in the plant tissues examined in this study is arginine ; nevertheless, acidic Nα- acylarginine derivatives which have been found in S. china and L. maximowiczii and published elsewhere could not be detected in bulbs of T. gesneriana, A. cepa, and A. sativum.

• 社団法人 日本農芸化学会の論文

著者

• Sakamura Sadao

  Department Of Agricultural Chemisitry Faculty Of Agriculture Hokkaido University

• Kasai Takanori

  Department Of Agricultura Chemistry Faculty Of Agriculture Hokkaido University

• Nishitoba Tsuyoshi

  Department Of Agricultural Chemistry Faculty Of Agriculture Hokkaido University

• SHIROSHITA Yoshinari

  Department of Agricultural Chemistry, Faculty of Agriculture, Hokkaido University

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