2. 微生物の高塩濃度環境における応答(セミナー「ストレスと生物のレスポンス」)

• 小野 比佐好

  大阪大学工学部応用生物工学科

書誌事項

タイトル別名

• 2. Adaptational Responses of Microorganisms to Hypersalinity(Lectures Presented at the Seminar of Japanese Society for Research of Freezing and Drying : "Responses of Living Organisms to Various Kind of Stresses")

抄録

Various responses are observed in bacteria to hyperosmotic pressure. Here, possibilities of some hypotheses for signals and sensors of osmotic pressure, and osmoprotectants were reviewed. Two-component regulatory system of sensor-effector seems plausible to detect any change in extracellular osmotic pressure and transduce it into various adaptational systems in the cells. Although there are many reports of osmoprotectants, it is remained as resolved question how these compounds can support cell growth. And, it was pointed out that gross analysis for them is not helpful for consideration of real situation in the cytoplasm. 'Ectoine', one of excellent osmoprotectants, was found in a moderate halophile, Halomonas sp. Unlike glycine betaine it is not known about the regulatory systems of ectoine accumulation with response to hypersalinity. But, all of the three enzymes, 2,4-diaminobutyric acid (2,4-DABA) transaminase, 2,4-DABA acetyltransferase, and ectoine synthase, were confirmed. The first and the third enzymes were purified and characterized. The results indicated that as a whole the pathway seems capable of synthesis of ectoine at approx. 0.5M NaCl.

収録刊行物

• 凍結および乾燥研究会会誌

  凍結および乾燥研究会会誌 39 (0), 68-72, 1993

  低温生物工学会

キーワード

• 浸透圧ストレス
• 耐塩性細菌
• 浸透圧補償溶質
• エクトイン
• 耐塩性酵素

詳細情報

• CRID: 1390001205087613440
• NII論文ID: 110007368532
• DOI: 10.20585/touketsukansokaishi.39.0_68
• ISSN: 24329916
• ISSN: 02888297
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可