Analysis of binding of recombinant Mxr1pN150 and Mxr1pN400 to pACS-MXREs by EMSA.
A, nucleotide sequence of oligonucleotides containing wild-type and mutant MXREs. MXREs are boxed. B, schematic of histidine-tagged Mxr1pN150 and GST-tagged Mxr1pN400. C, SDS-PAGE profile of Mxr1pN150 and Mxr1pN400 purified from E. coli lysates by nickel-nitrilotriacetic acid and glutathione affinity chromatography, respectively. D, analysis of binding of Mxr1pN150 and Mxr1pN400 to 32P-labeled oligonucleotides containing wild-type and mutant MXREs by EMSA. Complexes I and II are generated when Mxr1pN150 and Mxr1pN400 bind to both MXREs. Only complex I is obtained when Mxr1pN150 and Mxr1pN400 bind to only one of the MXREs. E, supershift of complexes I and II formed by His-tagged Mxr1pN150 by the addition of anti-His antibodies. F, abrogation of the formation of complexes I and II by GST-tagged Mxr1pN400 by addition of anti-GST antibodies.