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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 1994.1
- 수록면
- 267 - 267 (1page)
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초록· 키워드
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In order to obtain insight into the mechanism by which DNA containing a thymine photo-dimer is recognized by the excision repair enzyme, T$_4$ endonuclease V, we have taken NMR study of this protein and its complex with oligonucleotides. The conformations of five different DNA duplexes DNA I : d(GCGGATGGCG).d(CGCCTACCGC), DNA II d(GCGGTTGGCG) .d(CGCCAACCGC), DNA III : d(GCGGT ^ TGGCG) .d(CGCCAACCGC), DNA IV d(GCGGGCGGCG).d(CGCCCGCCGC) and DNA V d(GCGGCCGGCG) . d(CGCCGGCCGC) were studied by $^1$H NMR. The NMR spectra of these five DNA duplexes in the absence of the enzyme clearly show that the formation of a thymine dimer within the DNA induces only a minor distortion in the structure, and that the overall structure of B type DNA is retained. The photo-dimer formation is found to cause a large change in chemical shifts at the GC7 base pair, which is located at the 3'-side of the thymine dimer, accompanied by the major conformational change at the thymine dimer site. The binding of a mutant T$_4$ endonuclease V (E23Q), which is unable to digest DNA containing a thymine dimer, to the DNA duplex d(GCGGT ^ TGGCG)ㆍd(CGCCAACCGC) causes a large down-field shift in the imino proton resonance of GC7. Therefore, this position is thought to be either the crucial point of the interaction wi th T$_4$ endonuclease V, or the si to of a conformational change in the DNA caused by the binding of T$_4$ endonuclease V. Usually, it is very difficult to assign NMR peaks in DNA * protein complex because of severe peak overlaps. In order to overcome these peak overlaps, we used a method of deuterium incorporation.
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