Abstract
An approximately equal to 150-bp GC-rich (approximately equal to 60%) region is at the right end of rat long interspersed repeated DNA (LINE or L1Rn) family members. We report here that one of the DNA strands from this region contains several non-palindromic sites that strongly arrest DNA synthesis in vitro by the prokaryotic Klenow and T4 DNA polymerases, the eukaryotic alpha polymerase, and AMV reverse transcriptase. The strongest arrest sites are G-rich (approximately equal to 70%) homopurine stretches of 18 or more residues. Shorter homopurine stretches (12 residues or fewer) did not arrest DNA synthesis even if the stretch contains 11/12 G residues. Arrest of the prokaryotic polymerases was not affected by their respective single strand binding proteins or polymerase accessory proteins. The region of duplex DNA which contains DNA synthesis arrest sites reacts with bromoacetaldehyde when present in negatively supercoiled molecules. By contrast, homopurine stretches that do not arrest DNA synthesis do not react with bromoacetaldehyde. The presence of bromoacetaldehyde-reactive bases in a G-rich homopurine-containing duplex under torsional stress is thought to be caused by base stacking in the homopurine strand. Therefore, we suggest that base-stacked regions of the template arrest DNA synthesis.
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