Preparative enzymic synthesis of nucleoside-5'-phosphates

Area of Science:

• Biochemistry
• Enzymology
• Nucleoside Chemistry

Background:

• Phosphorylation is a key modification for nucleosides.
• Chemical phosphorylation methods can be harsh and inefficient.
• Enzymatic approaches offer specificity and milder conditions.

Purpose of the Study:

• To investigate the utility of wheat shoot phosphotransferase for nucleoside phosphorylation.
• To establish a large-scale enzymatic method for synthesizing nucleoside-5 omino-phosphates.
• To determine the substrate specificity of the enzyme.

Main Methods:

• Enzymatic phosphorylation using wheat shoot phosphotransferase and p-nitrophenylphosphate.
• Ion-exchange chromatography for purification and large-scale preparation.
• Enzyme assays using 5 omino-nucleotidase and E. coli alkaline phosphatase.

Main Results:

• The enzyme specifically phosphorylates the 5 omino-position of pentose nucleosides.
• High yields (80-90%) of nucleoside-5 omino-phosphates were achieved.
• The enzyme accepts substrates beyond typical pentose nucleosides, requiring a primary hydroxyl group.

Conclusions:

• Wheat shoot phosphotransferase is a versatile tool for synthesizing nucleoside-5 omino-phosphates.
• The enzymatic method is efficient, scalable, and applicable to labile nucleosides.
• Enzyme specificity is based on the presence of a primary hydroxyl group, not strictly a pentose sugar ring.