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Updated: Jul 28, 2026

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Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit
Published on: July 29, 2007
Purification of Escherichia coli DNA helicase I from plasmid-transformed cells
Abstract:
DNA helicase I was purified in large quantity from Escherichia coli cells harboring a plasmid that carries the gene encoding helicase I--the traI gene of the F sex factor--cloned in a high copy number vector. Electron microscopic studies on the purified material reveal new properties of the enzyme protein.

