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Polynucleotide kinase (bacteriophage-T4-infected Escherichia coli B) catalyses the transfer of the [gamma-16O,17O,18O]phosphoryl group from 5'[gamma(S)-16O,17O,18O]ATP to 3'-AMP with inversion of configuration at the phosphorus atom. The simplest interpretation of this observation is that the [gamma-16O,17O,18O]phosphoryl group is transferred directly from ATP to the co-substrate by an 'in-line' mechanism.

The stereochemical course of phosphoryl transfer catalysed by polynucleotide kinase (bacteriophage-T4-infected Escherichia coli B)