생명과학회지 (Journal of Life Science)

  • 제27권1호
  • /
  • Pages.50-56
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  • 2017
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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졸복의 아가미로부터 항균성 펩타이드의 정제

Purification of an Antibacterial Peptide from the Gills of the Pufferfish Takifugu pardalis

  • 김태영 (부경대학교 수산과학대학 생물공학과) ;
  • 고혜진 (부경대학교 수산과학대학 생물공학과) ;
  • 박남규 (부경대학교 수산과학대학 생물공학과)
  • Kim, Tae Young (Department of Biotechnology, College of Fisheries Sciences, Pukyong National University) ;
  • Go, Hye-Jin (Department of Biotechnology, College of Fisheries Sciences, Pukyong National University) ;
  • Park, Nam Gyu (Department of Biotechnology, College of Fisheries Sciences, Pukyong National University)
  • 투고 : 2016.09.28
  • 심사 : 2016.11.25
  • 발행 : 2017.01.30
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초록

졸복(Takifugu pardalis)의 아가미로부터 항균성 펩타이드를 정제하였다. 졸복 아가미의 산 추출물은 Sep-Pak C18에 의해 부분적으로 정제되었으며, 60% 메탄올 분획(RM60)은 Bacillus subtilis KCTC 1021에 대해 높은 항균활성을 나타내었다. 이 RM60을 사용하여 이온교환을 포함한 5단계의 연속적인 HPLC로 정제하였다. 정제된 펩타이드의 분자량과 아미노산 서열분석은 MALDI-TOF MS와 에드만 분해법으로 분석하였다. 이 펩타이드의 분자량은 약 1171.6 Da이었으며, 분석된 이 물질의 부분적인 일차구조서열은 다음과 같다; STKEKAPRKQ. 이 물질과 기존에 알려진 항균성 펩타이드들과 유사성을 조사한 결과, 정제된 물질은 histone H3 계열의 N-말단 부분과 유사하였다. 이러한 결과로부터 정제된 펩타이드는 졸복에서 반응하는 선천성 방어 시스템에서 중요한 역할을 하고 있다고 여겨진다.

An antibacterial peptide was purified from an acidified gill extract of the pufferfish Takifugu pardalis. The acidified gill extract was put through a Sep-Pak C18 solid phase extraction cartridge using a stepwise gradient and divided into a flow-through (F.T.) and 60% methanol fraction (RM 60). Among the eluents, RM 60 had potent antibacterial activity against Bacillus subtilis KCTC 1021. RM 60 was partially purified on a cationic-exchange column (SP-5PW) by a linear gradient, and the antibacterial peptide was then further purified, using a series of cationic-exchange and $C_{18}$ reversed-phase HPLC columns. For characterization of the purified peptide, its molecular weight and amino acid sequence were analyzed by MALDI-TOF MS and Edman degradation. The molecular weight of the peptide was about 1171.6 Da. The amino acid sequence of the peptide was partially determined as: STKEKAPRKQ. A comparison of the N-terminal amino acid sequence of the purified peptide with that of other known polypeptides revealed high homology with the N-terminus of the histone H3 protein, which belongs to the histone H3 family. Thus, this peptide was designated as a puffer fish gill (PFG)-related antimicrobial peptide. This is the report to describe an antimicrobial function for the N-terminus of histone H3 of an animal species. The findings suggest that this peptide plays a significant role in the innate defense system of the pufferfish.

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