カイコ消化液におけるD(-)-2,3-ジアミノプロピオン酸の抗細菌性

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タイトル別名
  • Antibacterial properties of D(-)-2,3-diaminopropionic acid contained in digestive juice of the silkworm larvae, Bombyx mori.
  • カイコ消化液におけるＤ（－）‐２，３‐ジアミノプロピオン酸の抗細菌性
  • カイコ ショウカエキ ニ オケル D 2 3 ジアミノ プロピオンサン ノ コ

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説明

The digestive juice of silkworm larvae exhibits strong antibacterial properties. D(-)-2, 3-diaminopropionic acid (D-DAPA) is contained in the digestive juice (DJ) (Wada and Toyota) of the silkworm. To determine the relationship between the antibacterial action and the presence of D-DAPA, the antibacterial action of D-DAPA in several species of bacteria was assayed in vitro. The concentrations of D-DAPA in the DJ were 1.372μ moles per ml DJ in larvae fed on mulberry leaves and 0.724μ moles per ml DJ in larvae fed on an artificial diet immediately after the 4th ecdysis, respectively. Inhibitory activity of D-DAPA on the growth of the bacteria was demonstrated in the cases of Streptococcus faecalis-S. faecium intermediate IFO 12368, Bacillus thuringiensis subsp. thuringiensis and Serratia marcescens but not in the cases of Bacillus cereus IFO 3001, Pseudomonas aeruginosa IFO 3445, Staphylococcus aureus IFO 3060 and Escherichia coli K12 strains. Concentration of D-DAPA required for the complete inhibition on the growth of S. faecalis-S. faecium intermediate was 10mM, and for partial inhibition in 5mM. Based on these results it is evident that the antibacterial action in the intestine of the silkworm can not be attributed to D-DAPA alone. D-DAPA seemed to be one of the antibacterial substances present in the digestive tract of the silkworm larvae.

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