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진주조 마이토콘드리아의 새로운 효소에 의해 유기된 pBR 322 DNA 의 foldback intercoil 구조
김병동,임용표 ( Byung Dong Kim,Yong Pyo Lim ) 생화학분자생물학회 1989 BMB Reports Vol.22 No.1
The foldback intercoil structure of pBR322 DNA was induced by an enzyme which we have recently isolated from pearl millet mitochondria. The enzymatic formation of the unique configurations, namely, the lasso, the stem, the loop, and the stem-and-loop on both the linear and the open circle pBR322 DNA effectively argues that the same configurations found earlier in the native pearl millet mtDNA were not artifacts. Most important, it was demonstrated that the intercoil DNA and the supercoil DNA can be resolved by the electron microscopy. We propose to call the pearl millet mitochondrial protein, $quot;the synaptase$quot;, since it induces intra- and inter-molecular synapsis of two double helical DNA strands.
The Foldback Intercoil Structure of pBR322 DNA Induced by a Novel Pearl Millet Mitochondrial Enzyme
김병동,임용표,Kim, Byung-Dong,Lim, Yong-Pyo Korean Society for Biochemistry and Molecular Biol 1989 한국생화학회지 Vol.22 No.1
pBR 322 DNA의 foldback intercoil 구조가 우리가 최근 진주조 마이토콘드리아에서 분리한 한 효소에 의해 유기되었다. 독특한 DNA 형태들, 즉 올가미, stem, loop, stem-and-loop 등이 선형과 원형 pBR322에서 효소에 의해 형성된다는 사실로 보아 이전에 진주조 마이토콘드리아 DNA에서 발견된 동일한 형태들이 artifact가 아니었음을 입증한다. 또한, 중요한 것은, intercoil DNA와 supercoil DNA가 전자현미경 방법으로 분명히 분별될 수 있음을 보여주었다. 우리는 이 진주조 마이토콘드리아 단백질을 "synaptase" (접합효소)로 부르기를 제안하는데, 이는 이 효소가 분자내 그리고 분자간에 두개의 이중나선 DNA의 접합을 유기하기 때문이다. The foldback intercoil structure of pBR322 DNA was induced by an enzyme which we have recently isolated from pearl millet mitochondria. The enzymatic formation of the unique configurations, namely, the lasso, the stem, the loop, and the stem-and-loop on both the linear and the open circle pBR322 DNA effectively argues that the same configurations found earlier in the native pearl millet mtDNA were not artifacts. Most important, it was demonstrated that the intercoil DNA and the supercoil DNA can be resolved by the electron microscopy. We propose to call the pearl millet mitochondrial protein, "the synaptase", since it induces intra- and inter-molecular synapsis of two double helical DNA strands.
Four-stranded DNA : an intermediate of homologous recombination and transposition
Byung Dong Kim(金昞東) 한국육종학회 1985 한국육종학회지 Vol.17 No.4
Stem-and-loop structures found in native duplex DNA from Pennisetum typhoides mitochondria suggest that four-straned DNA mediates homologous recombination and transposition. A space-filling model of DNA has been constructed for the stem-and-loop structure by using atomic coordinates of Watson-Crick DNA B Ⅰ model but with reversed chain directions(Hopkins’ B Ⅱ model). The stem forms four-stranded DNA by interduplex base pairing between inverted repeat sequences. A molecular pathway of homologous recombination involving four-stranded DNA formation has been proposed and tested with the space-filling model. Biological significance of the four-stranded DNA and repetitive sequences is discussed.
Symposium 7 : Plant Biochemistry ; Hot pepper genome and secondary metabolic pathways
김병동 ( Byung Dong Kim ),( Byoung Cheorl Kang ),( Seok Hyeon Nahm ),( Jin Hoe Huh ),( Hyun Sook Yoo ),( Jae Woong Yu ),( Min Woo Kim ),( Shin Je Kim ),( Soo Hyun Kim ),( Kwon Su Ha ),( Moon Hwan Lee ) 생화학분자생물학회 2000 생화학분자생물학회 추계학술발표논문집 Vol.2000 No.-