期刊
NUCLEIC ACIDS RESEARCH
卷 47, 期 16, 页码 8708-8719出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkz673
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资金
- Phi Sigma Graduate Student Biology Society
- University of Texas Arlington Research Enhancement (REP) Grant Program
Long Interspersed Elements (LINEs), also known as non-LTR retrotransposons, encode a multifunctional protein that reverse transcribes its mRNA into DNA at the site of insertion by target primed reverse transcription. The second half of the integration reaction remains very poorly understood. Second-strand DNA cleavage and second-strand DNA synthesis were investigated in vitro using purified components from a site-specific restriction-like endonuclease (RLE) bearing LINE. DNA structure was shown to be a critical component of second-strand DNA cleavage. A hitherto unknown and unexplored integration intermediate, an open '4-way' DNA junction, was recognized by the element protein and cleaved in a Holliday junction resolvase-like reaction. Cleavage of the 4-way junction resulted in a natural primer-template pairing used for second-strand DNA synthesis. A new model for RLE LINE integration is presented.
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