Crosslinking of diene-modified DNA with bis-maleimides.
The chemical crosslinking of modified nucleic acids via the Diels-Alder reaction is reported. For this purpose, 1,3-butadiene derived building blocks were incorporated into complementary oligodeoxynucleotides. Treatment of the obtained duplex with difunctional dienophiles results in the clean crosslinking of the two strands. Non-crosslinked adducts arising from a single Diels-Alder reaction of a maleimide to only one strand were not observed, indicating that the first reaction is the rate determining step of the overall process. Based on their thermal denaturation profiles, the crosslinked hybrids behave like two separate, hairpin-like structures, rather than like a single, continuous duplex.
Tona
Rolf
R
Department of Chemistry, University of Bern, CH-3012 Bern, Switzerland.
Haner
Robert
R
D002070:Butadienes / Q000737:chemistry*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D008301:Maleimides / Q000737:chemistry*; D008958:Models, Molecular; D009841:Oligonucleotides / Q000737:chemistry*; D013816:Thermodynamics
D002070:Butadienes; D003432:Cross-Linking Reagents; D008301:Maleimides; D009841:Oligonucleotides; C031763:1,3-butadiene