Die Synthese von neuen Monomer‐Bausteinen, die die Titelgruppe sowohl für den Phosphat‐ wie für den AgIykon‐Schutz enthalten, für die OligonucIeotid‐Synthese nach dem Phosphotriester‐Verfahren wird beschrieben.
The substrate specificity of 2'-deoxy-2'-substituted uridines and their 5'-phosphates towards thymidylate synthetase from Escherichia coli K12 was investigated. Besides the natural substrate 2'-deoxyuridine-5'-phosphate (dUMP), only 2'-deoxy-2'-fluorouridine-5'-phosphate (dUf IMP) was a substrate. The KM of dUfIMP is 11 times higher than that of dUMP, while the V values are virtually the same. It is concluded that the size of the 2'-su9gituent and not its polarity (and the concomitant conformational change) determines substrate specificity of thymidylate synthetase.
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