Journal of Applied Biological Chemistry

  • 제64권4호
  • /
  • Pages.369-374
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  • 2021
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  • 1976-0442(pISSN)
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  • 2234-7941(eISSN)
한국응용생명화학회 (The Korean Society for Applied Biological Chemistry)
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가돌리니움 이온에 의한 톨라신 용혈활성의 농도의존적 억제

Dose-dependent suppression of tolaasin-induced hemolysis by gadolinium ion

  • Huh, Jeong-Hoon (Department of Environmental and Biological Chemistry, Chungbuk National University) ;
  • Yun, Yeong-Bae (Department of Environmental and Biological Chemistry, Chungbuk National University) ;
  • Kim, Young-Kee (Department of Environmental and Biological Chemistry, Chungbuk National University)
  • 투고 : 2021.09.24
  • 심사 : 2021.10.09
  • 발행 : 2021.12.31
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⟨ 이전 논문 다음 논문 ⟩

초록

느타리버섯의 갈반병은 Pseudomonas tolaasii에 의해 생성된 톨라신 및 이의 유사 펩티드 독소에 의해 발생한다. 톨라신 펩티드들은 세포막에 pore를 형성하고 버섯의 자실체 구조를 파괴한다. 적혈구가 파괴되는 용혈은 톨라신의 세포독성에 의해 일어난다. 톨라신의 용혈활성은 Zn2+ 및 Ni2+과 같은 금속 이온에 의해 저해된다. 가돌리니움 이온을 첨가하였을 때, 톨라신에 의한 용혈작용에서 1 mM 이하의 농도에서는 용혈작용이 증가하고 그 이상의 농도에서는 저해되는 이중 효과가 나타났다. 가돌리니움 이온에 의한 톨라신 활성저해 기작은 다른 양이온들에 의한 저해기작과 다른 것으로 보인다. 가돌리니움 이온은 음전하를 갖는 막지질들에 결합하여 지질막의 측압을 변화시키는 것으로 보고되어, 톨라신 이온통로의 여닫힘에 직접 작용하기 보다는 막 구조의 단단함을 증가시켜 막에 대한 톨라신 이온통로의 안정성을 감소시키는 것으로 보인다.

Brown blotch disease of oyster mushrooms is caused by tolaasin and its analog peptide toxins which are produced by Pseudomonas tolaasii. Tolaasin peptides form pores in the plasma membrane and destroy the fruiting body structure of mushroom. Lysis of red blood cells, hemolysis, can be occurred by cytotoxic activity of tolaasin. The hemolytic activity of tolaasin is inhibited by metal ions, such as Zn2+ and Ni2+. When Gadolinium ion was added, a biphasic effect was observed on tolaasin-induced hemolysis, an increase in hemolysis at submillimolar concentrations and an inhibition at millimolar concentrations. The mechanism of gadolinium ion-induced inhibition of tolaasin activity may not be similar to those of the inhibitions by other metal ions. Since gadolinium ion has been reported to change a lateral pressure of lipid membrane by binding to the negative charges of membrane lipids, it may not directly work on the tolaasin channel gating, but rather decrease the stability of tolaasin channel by increasing firmness of membrane.

키워드

과제정보

이 논문은 2017년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임(No. 2017R1D1A3B03032718).

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