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• W1479917310 startingPage "6137" @default.
• W1479917310 abstract "We investigated the ability of natural polyamines putrescine, spermidine, and spermine to provoke a left-handed Z-DNA conformation in a recombinant plasmid (pDHg16) with a 23-base pair insert of (dG-dC)n.(dG-dC)n sequences. Using a monoclonal anti-Z-DNA antibody (Z22) and an enzyme-linked immunosorbent assay protocol, we found that spermidine and spermine were capable of converting pDHg16 to the Z-DNA form. The concentrations of spermidine and spermine at the midpoint of the B-DNA to Z-DNA transition were 280 and 5 microM, respectively, in buffer containing 50 mM NaCl, 1 mM sodium cacodylate, and 0.15 mM EDTA, pH 7.4. A plot of ln[Na+] versus ln [spermine4+], where [Na+] is the bulk NaCl concentration and [spermine4+] is the spermine concentration at the midpoint of the B-DNA to Z-DNA transition, gave a straight line with a slope of 1.2. Structural specificity was clearly evident in the efficacy of three spermidine homologs to induce the Z-DNA conformation in pDHg16. Putrescine and acetylspermidines had no effect on the conformation of the plasmid DNA up to a 3 mM concentration. Control experiments with the parental plasmid (pDPL6) showed no binding of the plasmid DNA with Z22. These results indicate that spermidine and spermine are capable of provoking the left-handed Z-DNA conformation in small blocks of (dG-dC)n sequences embedded in a right-handed B-DNA matrix. Since blocks of (dG-dC)n sequences are found in certain native DNAs, conformational alterations of these regions to the Z-DNA form in the presence of polyamines may have important gene regulatory effects." @default.
• W1479917310 created "2016-06-24" @default.
• W1479917310 creator A5026272781 @default.
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• W1479917310 date "1991-04-01" @default.
• W1479917310 modified "2023-10-18" @default.
• W1479917310 title "Polyamine-induced B-DNA to Z-DNA conformational transition of a plasmid DNA with (dG-dC)n insert." @default.
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• W1479917310 doi "https://doi.org/10.1016/s0021-9258(18)38095-5" @default.
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