S. Korolev, M. Nayal, W. Barnes, E. Di Cera, and G. Waksman.
Crystal structure of the large fragment of Thermus aquaticus DNA polymerase I at 2.5-A resolution: Structural basis for thermostability.
Proc. Natl. Acad. Sci. USA. 92:9264-9268. (1995)

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The crystal structure of the large fragment of the Thermus aquaticus DNA polymerase (Klentaq1), determined at 2.5-A resolution, demonstrates a compact two-domain architecture. The C-terminal domain is identical in fold to the equivalent region of the Klenow fragment of Escherichia coli DNA polymerase (Klenow pol I). Although the N-terminal domain of Klentaq1 differs greatly in sequence from its counterpart in Klenow pol I, it has clearly evolved from a common ancestor. The structure of Klentaq1 reveals the strategy utilized by this protein to maintain structural activity at high temperatures and provides the structural basis for future improvements of the enzyme.

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