DNA bending by the mammalian high-mobility group protein AT hook 2.
The mammalian high-mobility group protein AT hook 2 (HMGA2) is a DNA binding protein that specifically recognizes the minor groove of AT-rich DNA sequences. Disruption of its expression pattern is directly linked to oncogenesis and obesity. In this paper, we constructed a new plasmid pBendAT to study HMGA2-induced DNA bending. pBendAT carries a 230 bp DNA segment containing five pairs of restriction enzyme sites, which can be used to produce a set of DNA fragments of identical length to study protein-induced DNA bending. The DNA fragments of identical length can also be generated using PCR amplification. Since pBendAT does not contain more than three consecutive AT base pairs, it is suitable for the assessment of DNA bending induced by proteins recognizing AT-rich DNA sequences. Indeed, using pBendAT, we demonstrated that HMGA2 is a DNA bending protein and bends all three tested DNA binding sequences of HMGA2, SELEX1, SELEX2, and PRDII. The DNA bending angles were estimated to be 34.2 degrees , 33.5 degrees , and 35.4 degrees , respectively.
Chen
Bo
B
Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th Street, Miami, Florida 33199, USA.
Young
Jasmine
J
Leng
Fenfei
F
D001483:Base Sequence; D001665:Binding Sites; D004247:DNA / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D025743:HMGA2 Protein / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010957:Plasmids / Q000737:chemistry / Q000235:genetics; D011485:Protein Binding
D025743:HMGA2 Protein; D004247:DNA