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• W1488334471 abstract "New fluorescent derivatives of dinucleoside monophosphates, (5'-AmNS)UpA/ApU/GpU/CpA, with a fluorophore, 1-aminonaphthalene-5-sulfonic acid (AmNS), attached to the first nucleotide of the dinucleoside monophosphates via a 5'-secondary amine linkage were synthesized in good yield. The chemical structure of (5'-AmNS)ApU was proved by the phosphodiesterase digestion followed by Whatman No. 3MM paper chromatographic and spectroscopic analysis of the digested products. The ability of these analogs to be incorporated into the 5' terminus of RNA chain forming fluorescent oligonucleotides by Escherichia coli RNA polymerase was studied in the presence of a synthetic DNA template. The enzymatic reaction of (5'-AmNS)UpA and [3H]UTP in the presence of poly(dA-dT) yielded (5'-AmNS)UpAp[3H]U in greater than 30% yield with the Km values of 5 and 2.5 microM and Vmax values of 17 and 25 nmol/min/mg of enzyme for (5'-AmNS)UpA and UpA, respectively. The structure of this fluorescent trinucleotide was identified by RNase A digestion and paper chromatographic analysis of the digested products. (5'-AmNS)UpA or (5'-AmNS)ApU exhibits two absorption maxima around 270 and 340-350 nm and a fluorescent emission maximum at 445 nm when excited at 340 nm. These spectral characteristics permit their use as energy donors for the transfer of energy to the intrinsic cobalt of the cobalt-substituted RNA polymerases. Upon hydrolysis of the phosphodiester bond of these analogs by venom phosphodiesterase, the absorption at 340 and 270 nm increased by 5 and 20%, respectively, while their fluorescence at 445 nm was enhanced by 25%. Thus, these analogs can be used for studying the dynamics of initiation and elongation reactions catalyzed by DNA-dependent RNA polymerases by absorption and fluorescence spectroscopies." @default.
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• W1488334471 date "1987-08-01" @default.
• W1488334471 modified "2023-09-30" @default.
• W1488334471 title "Synthesis and characterization of fluorescent dinucleotide substrate for the DNA-dependent RNA polymerase from Escherichia coli." @default.
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• W1488334471 doi "https://doi.org/10.1016/s0021-9258(18)61018-x" @default.
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