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Expression, Purification, and Biochemical Evaluation of Human RAD51 Protein.

The RAD51 DNA strand exchange protein plays an important role in maintaining the integrity of the human genome. It promotes homology-directed DNA repair by exchanging strands between the damaged and the intact DNA molecules. It also plays an important role in stabilizing distressed DNA replication forks. When overexpressed or misregulated, however, RAD51 contributes to "rogue," genome destabilizing events that can lead to cancer, cell death, and to acquisition of chemotherapy resistance by cancerous cells. Human RAD51 is, therefore, an important and highly coveted anticancer drug target. Biochemical, biophysical, and structural studies of the human RAD51 and establishment of its structure-activity relationship require purification of large quantities of protein. In this chapter we describe a robust method for expression and purification of human RAD51 and the methods for assessing its activity based on the single-strand DNA-binding stoichiometry and its capacity to carry out the DNA strand exchange reaction.

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