Document Type

Article

Publication Date

1-19-2015

Abstract

DNA replication in bacteria is accomplished by a multicomponent replicase, the DNA polymerase III holoenzyme (pol III HE). The three essential components of the pol III HE are the α polymerase, the β sliding clamp processivity factor, and the DnaX clamp-loader complex. We report here the assembly of the functional holoenzyme from Thermus thermophilus (Tth), an extreme thermophile. The minimal holoenzyme capable of DNA synthesis consists of α, β and DnaX ( and γ), and components of the clamp-loader complex. The proteins were each cloned and expressed in a native form. Each component of the system was purified extensively. The minimum holoenzyme from these five purified subunits reassembled is sufficient for rapid and processive DNA synthesis. In an isolated form the α polymerase was found to be unstable at temperatures above 65°C. We were able to increase the thermostability of the pol III HE to 98°C by addition and optimization of various buffers and cosolvents. In the optimized buffer system we show that a replicative polymerase apparatus, Tth pol III HE, is capable of rapid amplification of regions of DNA up to 15,000 base pairs in PCR reactions.

Comments

© 2015 Hindawi Publishing Corporation. Published under Creative Commons Attribution License. Original published version available at http://doi.org/10.1155/2015/837842.

Ribble, W., Kane, S., Bullard, R. Long-Range PCR Amplification of DNA by DNA Polymerase III Holoenzyme From Thermus Thermophilus. Enzyme Research 2015, vol. 2015, article no. 837842.

Publication Title

Enzyme Research

DOI

10.1155/2015/837842

Included in

Chemistry Commons

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