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Nucleic Acids Research, 1994, Vol. 22, No. 19 3918-3924
© 1994
MOLECULAR BIOLOGY |
Production and characterization of recombinant human Ku antigen
Departments of Microbiology and Dermatology, University of Texas Southwestern Medical Center Dallas, TX 75235, USA
*To whom correspondence should be addressed
Received June 10, 1994. Revised August 17, 1994. Accepted August 17, 1994.
Ku is an ubiquitous nuclear heterodimeric protein consisting of p70 and p86 subunits that binds doublestranded DNA termini and associates with chromosomes in vivo. It was originally described as an autoantigen in patients with certain autoimmune diseases. The individual subunits of Ku have been difficult to isolate from human cells without denaturation and attempts to produce functional recombinant Ku have been largely unsuccessful. Here, we utilize two recombinant baculoviral vectors that carry p70 or p86 cDNA and express the Ku subunits individually as well as assemble them into the complete Ku heterodimer. In an electrophoretic mobility shift assay, recombinant Ku binds to linear double-stranded DNA but not to supercoiled, nicked circular, nor linear single-stranded DNA. Neither subunit binds DNA by itself indicating that heterodimerization is essential for function. We also describe a simple purification method for the isolation of highly purified recombinant Ku using a hexahistidine tag. The baculovirus expression system provides a stable and efficient source of not only the p70 and p86 subunits but also the functional Ku heterodimer.
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