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pubmed-article:4034395pubmed:abstractTextAnalogs of alternating purine-pyrimidine DNA polymers such as poly(dA-dT)-poly(dA-dT) can be made with phosphorothioate groups in the DNA backbone. A phosphorothioate diester at the 5'-purine-pyrimidine-3' step causes a significant lowering of the polymer's melting temperature compared to a phosphorothioate diester at the 5'-pyrimidine-purine-3' step. This may occur because sulfur substitution increases anionic charge density in the DNA minor groove and 5'-purine-pyrimidine-3' steps narrow the minor groove. The ability to modulate charge density in the DNA backbone via sulfur substitution should prove useful in studies of sequence-dependent conformational changes in DNA.lld:pubmed
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pubmed-article:4034395pubmed:articleTitleEvidence for sequence-specific conformational changes in DNA from the melting temperatures of DNA phosphorothioate derivatives.lld:pubmed
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