Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Purification of an Antibacterial Peptide from the Gills of the Pufferfish Takifugu pardalis

졸복의 아가미로부터 항균성 펩타이드의 정제

  • 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)
  • 김태영 (부경대학교 수산과학대학 생물공학과) ;
  • 고혜진 (부경대학교 수산과학대학 생물공학과) ;
  • 박남규 (부경대학교 수산과학대학 생물공학과)
  • Received : 2016.09.28
  • Accepted : 2016.11.25
  • Published : 2017.01.30
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Abstract

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.

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.

Keywords

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