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생화학분자생물학회 (Korean Society for Biochemistry and Molecular Biology)
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DNA Light-strand Preferential Recognition of Human Mitochondria Transcription Termination Factor mTERF

  • Nam, Sang-Chul (Department of Biological Sciences, Korea Advanced Institute of Science and Technology) ;
  • Kang, Chang-Won (Department of Biological Sciences, Korea Advanced Institute of Science and Technology)
  • 발행 : 2005.11.30
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초록

Transcription termination of the human mitochondrial genome requires specific binding to termination factor mTERF. In this study, mTERF was produced in E. coli and purified by two-step chromatography. mTERF-binding DNA sequences were isolated from a pool of randomized sequences by the repeated selection of bound sequences by gel-mobility shift assay and polymerase chain reaction. Sequencing and comparison of the 23 isolated clones revealed a 16-bp consensus sequence of 5'-GTG$\b{TGGC}$AGANCCNGG-3' in the light-strand (underlined residues were absolutely conserved), which nicely matched the genomic 13-bp terminator sequence 5'-$\b{TGGC}$AGAGCCCGG-3'. Moreover, mTERF binding assays of heteroduplex and single-stranded DNAs showed mTERF recognized the light strand in preference to the heavy strand. The preferential binding of mTERF with the light-strand may explain its distinct orientation-dependent termination activity.

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참고문헌

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