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Abstract
Replicative helicase and polymerase form the leading-strand replisome that unwinds parental DNA and performs continuous leading-strand DNA synthesis. Uncoupling of the helicase-polymerase complex results in replication stress, replication errors, and genome instability. Although numerous replisomes from different biological systems have been reconstituted and characterized, structural investigations of the leading-strand replisome complex are hindered by its large size and dynamics. We have determined the first replisome structure on a fork substrate with bacteriophage T7 replisome as a model system. Here, we summarized our protocols to prepare and characterize the coupled T7 replisome complex. Similar methods can potentially be applied for structural investigations of more complicated replisomes.
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