Abstract
Many candidate unnatural DNA base pairs have been developed, but surprisingly, some of the best replicated adopt intercalated structures in free DNA that are difficult to reconcile with known mechanisms of polymerase recognition. Here we present crystal structures of KlenTaq DNA polymerase at different stages of replicating one of the more promising pairs, dNaM-d5SICS, and show that efficient replication results from the polymerase itself inducing the required natural-like structure.
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