In the solid-phase synthesis of oligonucleotides containing the pyrimidine(6-4)pyrimidone photoproduct using a dinucleotide building block, considerable amounts of by-products were found as the chain length increased. The by-products were the major product when a 49mer was synthesized on a 40
Three nonhydrolyzable aspartyl adenylate analogs have been prepared and tested as inhibitors of E. coli aspartyl-tRNA synthetase. 5'-O-[N-(L-Aspartyl)sulfamoyl]adenosine is a potent competitive inhibitor (K(i) = 15 nM) whereas L-aspartol adenylate is a weaker inhibitor (K(i) = 45 microM) with respect
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