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pubmed-article:2214028pubmed:abstractTextThe integration protein (IN) of Moloney murine leukemia virus (MuLV), purified after being produced in yeast cells, has been analyzed for its ability to bind its putative viral substrates, the att sites. An electrophoretic mobility shift assay revealed that the Moloney MuLV IN protein binds synthetic oligonucleotides containing att sequences, with specificity towards its cognate (MuLV) sequences. The terminal 13 base pairs, which are identical at both ends of viral DNA, are sufficient for binding if present at the ends of oligonucleotide duplexes in the same orientation as in linear viral DNA. However, only weak binding was observed when the same sequences were positioned within a substrate in a manner simulating att junctions in circular viral DNA with two long terminal repeats. Binding to att sites in oligonucleotides simulating linear viral DNA was dependent on the presence of the highly conserved CA residues preceding the site for 3' processing (an IN-dependent reaction that removes two nucleotides from the 3' ends of linear viral DNA); mutation of CA to TG abolished binding, and a CA to TA change reduced affinity by at least 20-fold. Removal of either the terminal two base pairs from both ends of the oligonucleotide duplex or the terminal two nucleotides from the 3' ends of each strand did not affect binding. The removal of three 3' terminal nucleotides, however, abolished binding, suggesting an essential role for the A residue immediately upstream of the 3' processing site in the binding reaction. These results help define the sequence requirements for att site recognition by IN, explain the conservation of the subterminal CA dinucleotide, and provide a simple assay for sequence-specific IN activity.lld:pubmed
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pubmed-article:2214028pubmed:articleTitleMoloney murine leukemia virus integration protein produced in yeast binds specifically to viral att sites.lld:pubmed
pubmed-article:2214028pubmed:affiliationDepartment of Microbiology and Immunology, University of California, San Francisco 94143.lld:pubmed
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