—DNA Nanostructure Controls Transcription “Opening of tubular nanostructure exposes DNA template, thereby increasing gene transcription” Japanese scientists have designed a DNA nanostructure that mechanically controls gene transcription (J. Am. Chem. Soc., DOI: 10.1021/ja2074856). Hiroshi Sugiyama, Masayuki Endo, and coworkers at Kyoto University attached a tubular DNA nanostructure to a double-stranded DNA template containing a promoter region that is enclosed in the tube. The tube also has single-stranded DNA called toehold strands. When complementary DNA binds to these toehold strands, the tube opens, exposing the promoter region and giving RNA polymerase access to the template. With the structure open, the researchers observe a more than fivefold jump in gene transcription, compared with when the structure is closed.
by Celia Henry Arnaud |
February 06, 2012