생명과학회지 (Journal of Life Science)

  • 제15권2호
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  • Pages.192-196
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  • 2005
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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Schizosaccharomyces pombe에서 SNF2에 속하는 hrp2+ 유전자의 특성 연구

Isolation and Characterization of hrp2+ Gene Related to SNF2 Family In Yeast

  • 발행 : 2005.04.01
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초록

본 연구는 분열형 효모 Schizosaccharomyces pombe에서 여러 가지 DNA 절제회복 및 유전자 발현에 관여하는 SNF2/SW12유전자의 기능을 연구하기 위하여 이에 관련되는 유전자를 분리하고 그 특성을 연구하였다. SNF2 motif의 conserved sequence를 primer로 하여 중합효소 연쇄반응 (PCR) 방법으로 480 bp 크기의 DNA fragment를 분리하여, 이를 probe로 하여 효모에서 hrp2+ 유전자를 분리하였다. 분리한 hrp+ 유전자의 sequence homology를 비교한 결과 3개의 SNF2 motif를 포함하고 있었다. hrp2+ 유전자의 전사체 크기는 4.7kb임을 Northern hybridization으로 확인하였다. 분리한 유전자의 특성 연구를 위하여 Northern hybridization 으로 hrp2+ 유전자의 UV와 MMS에 대한 유도성을 조사한 결과 자외선에 대해서만 유전자의 발현이 유도되었다. 이 결과 분리한 hrp2+는 UV-inducible 유전자임을 확인하였다. 또한 분리한 유전자의 특성연구 중 하나로 hrp2+ 단백질을 분리하여 helicase activity를 측정하였다. 이 결과 분리한 hrp2+ 유전자는 전혀 helicase activity를 나타내지 않았다.

The SNF2/SW12 family comprises proteins from a variety of species with in vivo functions, such as transcriptional regulation, maintenance of chromosome stability during mitosis, and various types of DNA repair. This study was shown the characterization of hrp2+ gene which was isolated by PCR amplification using the conserved domain of SNF2 motifs. Sequence analysis of hrp2+ gene showed striking evolutionary conservation among the SNF2 family of proteins. The transcript of hrp2+ gene was found to be a 4.7 kb as identified by Northern hybridization. To investigate the inducibility of hrp2+ gene, transcript levels were examined after treating the cells to various DNA damaging agents. The transcripts of hrp2+ were induced by UV-irradiation. But the transcripts were not induced by treatment of $ 0.25\%$ Methylmethane sulfonate (MMS). These results implied that the effects of damaging agents are complex and different regulatory pathways exist for the induction of this gene. Hrp2 protein was purified near homogeneity by combination of affinity chromatography. We tested the purified Hrp2 protein for the helicase activity in an oligonucleotide release assay. However we were unable to detect any helicase activity associated with the Hrp2 protein, indicating that the helicase motifs in Hrp2 are merely indicators of a broader DNA-dependent ATPase activity.

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