Nucleic Acids Research, Vol 25, Issue 12 2352-2358, Copyright © 1997 by Oxford University Press
T Yamaguchi, K Suyama, K Narita, S Kohgo, A Tomikawa and M Saneyoshi
Photolabile 2'-deoxy- E -5-[4-(3-trifluoromethyl-3 H-diazirin-3-
yl)styryl]uridine and its protected phosphoramidite derivatives have been
synthesized and introduced into DNA oligomers through solid-phase DNA
synthesis. The (trifluoromethyldiazirinyl)stylyl moiety of this nucleoside
was found to be sufficiently stable for automated DNA synthesis. In
addition, this moiety was found to be stable at 60 degrees C in aqueous
solution under the annealing conditions for duplex formation with
complementary strands, since >95% of the photolabile nucleoside remained
after heating for 1 h. The oligo(dT) 15mer analog bearing the photolabile
residue was activated/decomposed by near-UV irradiation. In photoaffinity
cross-linking experiments with recombinant rat DNA polymerasebeta,
constituted from a 40 kDa polypeptide, using oligo(dT) 15mer analogs
bearing the photolabile residue near the 3'-terminus, a covalently bound
complex of 45 kDa was obtained in the presence of complementary templates.
Thus it was demonstrated that our method for synthesis of photolabile
oligodeoxyribonucleotides may be useful for studies of DNA-related enzymes
and DNA binding proteins.
ARTICLES
Synthesis and evaluation of oligodeoxyribonucleotides containing an aryl(trifluoromethyl)diazirine moiety as the cross-linking probe: photoaffinity labeling of mammalian DNA polymerase beta
Department of Biological Sciences, Teikyo University of Science and Technology, 2525 Yatsuzawa, Uenohara, Yamanashi 409-01, Japan. toyofumi@ntu.ac.jp
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