Synthesis and Evaluation of New Spacers for Use as dsDNA End-Caps
作者:Pei-Sze Ng、Brian M. Laing、Ganesan Balasundarum、Maneesh Pingle、Alan Friedman、Donald E. Bergstrom
DOI:10.1021/bc100202y
日期:2010.8.18
A series of aliphatic and aromatic spacer molecules designed to cap the ends of DNA duplexes have been synthesized. The spacers were converted into dimethoxytrityl-protected phosphoramidites as synthons for oligonucleotides synthesis. The effect of the spacers on the stability of short DNA duplexes was assessed by melting temperature studies. End-caps containing amide groups were found to be less stabilizing than the hexaethylene glycol spacer. End-caps containing either a terthiophene or a naphthalene tetracarboxylic acid diimidc were found to be significantly more stabilizing. The former showed a preference for stacking above an A.T base pair. Spacers containing only methylene (-CH2-) and amide (-CONH-) groups interact weakly with DNA and consequently may be optimal for applications that require minimal influence on DNA structure but require a way to hold the ends of double-stranded DNA together.
Endcaps for Stabilizing Short DNA Duplexes
作者:Pei-Sze Ng、Maneesh R. Pingle、Ganesan Balasundarum、Alan Friedman、Xiaolin Zu、Donald E. Bergstrom
DOI:10.1081/ncn-120023088
日期:2003.10
double-stranded DNA are described. Endcap diols were converted into DMTr protected phosphoramidites and incorporated between nucleotides 4 and 5 of a self-complementary octamer. The stabilizing effect of the endcaps on duplex DNA was determined by Tm experiments on the self-complementary octamer.