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. 1992 Aug 11;20(15):3859–3864. doi: 10.1093/nar/20.15.3859

The vacuum UV CD spectra of G.G.C triplexes.

K H Johnson 1, R H Durland 1, M E Hogan 1
PMCID: PMC334059  PMID: 1508671

Abstract

Vacuum UV circular dichroism (CD) spectra were measured down to 175 nm for d(C)10, d(G)10, the d(G)10.d(C)10 duplex, and the d(G)10.d(G)10.d(C)10 triplex. A CD difference spectrum was calculated for d(G)10.d(C)10 giving the change in CD induced by forming the duplex from d(G)10 and d(C)10. The d(G)10.d(G)10.d(C)10 CD difference spectrum gave the CD induced by triplex formation from binding of d(G)10 to the d(G)10.d(C)10 duplex. In the near-UV, the d(G)10.d(C)10 and d(G)10.d(G)10.d(C)10 difference spectra resembled the difference spectrum for poly[r(G).r(C)] (Biopolymers 29, 325-333). This similarity may be an indication of similar purine base stacking. The d(G)10.d(G)10.d(C)10 vacuum UV difference spectrum had a negative band at 195 nm and a positive band at 180 nm, making it similar to difference spectra for homopolymer triplexes containing T.A.T and U.A.U triplets (Nucl. Acids Res. 19, 2275-2280). The appearance of these bands in difference spectra should be good indicators of triplex formation. The complementary oligonucleotides c-mycI d(CCCCACCCTCCC) and c-mycII d(GGGAGGGTGGGG) are part of the regulatory sequences of the human c-myc gene. G.G.C rich triplexes formed by binding c-mycII or c-mycIII d(GGGGTGGGTGGG) to the c-mycI.c-mycII duplex had CD difference spectra similar to that of d(G)10.d(G)10.d(C)10 in both the vacuum UV and near UV regions, indicating similar triplet structures.

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Selected References

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