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• W2083399125 abstract "EDTA-derivatized deoxythymidine (dT-EDTA), incorporated into DNA and complexed to Fe2+ in the presence of dithiothreitol, is a widely used reagent for sequence-specific cleavage of duplex DNA. Using HPLC/electrospray mass spectrometry, we show that cleavage is specific to Fe2+, and no cleavage occurs when DNA-EDTA is complexed to other metal ions such as Ca2+, Mn2+, and Fe3+ even after many days. Because dT-EDTA can be incorporated at any desired position of a synthetic oligonucleotide, DNA-EDTA is ideally suited for the measurement of intermolecular paramagnetic relaxation enhancement effects between a paramagnetic ion chelated to DNA-EDTA and a bound protein. Measurements on the SRY/DNA-EDTA complex using two double-stranded oligonucleotides bearing dT-EDTA at opposite ends of the sequence indicate that intermolecular 1HN-T2 enhancement by chelated Mn2+ can be used to readily ascertain the polarity of protein binding to DNA and to derive quantitative long-range distance information for structure refinement. In the case of the SRY-DNA complex, excellent agreement between observed and calculated 1HN-T2 paramagnetic relaxation enhancement data can be achieved with insignificant shifts in the atomic coordinates ( approximately 0.25 A for all heavy atoms) while simultaneously satisfying all other experimental restraints. A unique feature of DNA-EDTA is that the relaxation enhancement effect can be tuned by judicious choice of the paramagnetic metal ion, thereby permitting a wide range of long-range intermolecular electron-proton distances, ranging from approximately 9 to 35 A, to be probed." @default.
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• W2083399125 date "2003-05-13" @default.
• W2083399125 modified "2023-10-11" @default.
• W2083399125 title "EDTA-Derivatized Deoxythymidine as a Tool for Rapid Determination of Protein Binding Polarity to DNA by Intermolecular Paramagnetic Relaxation Enhancement" @default.
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• W2083399125 doi "https://doi.org/10.1021/ja034488q" @default.
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