생명과학회지 (Journal of Life Science)

  • 제22권3호
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  • Pages.387-397
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  • 2012
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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Myomodulin A 및 유도체들의 합성 및 생리활성

Synthesis and Biological Activities of Myomodulin A and Its Analogs

  • 박남규 (부경대학교 수산과학대학 생물공학과)
  • Park, Nam-Gyu (Department of Biotechnology, Fisheries Science College, Pukyong National University)
  • 투고 : 2011.12.21
  • 심사 : 2012.01.25
  • 발행 : 2012.03.30
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초록

군소인 Aplysia kurodai의 중추신경절로부터 정제된 myomodulin A (MMA)가 정제되었다. MMA의 일차구조는 Pro-Met-Ser-Met-Leu-Arg-Leu-$NH_2$이며, 이 펩타이드는 다른 연체동물에서 발견된 myomodulin 계열의 펩타이드와 같은 구조를 지닌다. 정제된 MMA는 Mytilus edulis의 anterior byssus retractor muscle (ABRM)에서 phasic contraction을 조절하는 것으로 나타났다. MMA의 구조와 활성간의 상관관계를 알아보기 위해서 MMA, Des[$Pro^1$]-MMA, Des[$Pro^1,Met^2$]-MMA, Des[$Pro^1,Met^2,Ser^3$]-MMA 및 MME를 합성하였다. Des[$Pro^1$]-MMA, Des[$Pro^1,Met^2$]-MMA 및 Des[$Pro^1,Met^2,Ser^3$]-MMA의 일차구조는 각각 Met-Ser-Met-Leu-Arg-Leu-$NH_2$, Ser-Met-Leu-Arg-Leu-$NH_2$ 및 Met-Leu-Arg-Leu-$NH_2$이다. MMA 및 합성 물질들을 사용하여 ABRM 및 Achatinafulica의 소낭과 penial retractor muscle에 대해 활성을 측정하였다. MMA는 $1{\times}10^{-8}$ M 또는 더 낮은 농도에서 ABRM의 수축활성을 증가시키는 것으로 나타났지만, $1{\times}10^{-8}$ M 또는 고농도에서는 phasic contraction을 억제하였다. MMA와 유도체들은 소낭에 대해서는 수축반응을 보였지만, penial retractor muscle에 대해서는 이완 활성을 나타내었다. 이러한 결과들은 MMA의 C-말단부위에 있는 Met-Leu-Arg-Leu-$NH_2$가 ABRM의 수축반응뿐만 아니라 연체동물의 생식기능 및 소화 활성을 조절하기 필요한 최소한의 구조라는 것을 나타낸다.

In this study, we focused on myomoduline A (MMA) released from the central nervous system of Aplysia kurodai. The primary structure of MMA is Pro-Met-Ser-Met-Leu-Arg-Leu-$NH_2$. This peptide is the same as that of the myomodulin family peptide found in other mollusks. The purified MMA showed a modulating activity of phasic contraction on the anterior byssus retractor muscle (ABRM) of Mytilus edulis. In order to study the relationship between the structure and biological activity of MMA, we synthesized MMA, Des[$Pro^1$]-MMA, Des[$Pro^1,Met^2$]-MMA, Des[$Pro^1,Met^2,Ser^3$]-MMA, and MME. The amino acid sequences of Des[$Pro^1$]-MMA, Des[$Pro^1,Met^2$]-MMA, and Des[$Pro^1,Met^2,Ser^3$]-MMA were Met-Ser-Met-Leu-Arg-Leu-$NH_2$, Ser-Met-Leu-Arg-Leu-$NH_2$, and Met-Leu-Arg-Leu-$NH_2$, respectively. MMA and synthetic peptides were tested on ABRM in M. edulis as well as muscle preparations in Achatina fulica. At $1{\times}10^{-8}$ M or lower, MMA showed a potentiating effect on phasic contraction of the ABRM, but this peptide had an inhibitory effect at $1{\times}10^{-6}$ M or higher. Both MMA and its analogs stimulated a contractile response on the crop and a relaxed catch-relaxing response on the penial retractor muscle of A. fulica. These results suggest that Met-Leu-Arg-Leu-$NH_2$ in MMA is the minimum structure required for the regulation of the contraction of ABRM, as well as the reproductive and digestive activities of mollusks.

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