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Adenosine 5'[gamma(S)-16O, 17O, 18O]triphosphate has been synthesized and used to determine the stereochemical course of phosphoryl transfer catalysed by yeast hexokinase. The chirality at phosphorus of the D-glucose 6-[16O,17O,18O]phosphate formed was analysed, after cyclization and methylation, by 31P n.m.r. spectroscopy. The phosphoryl transfer was found to occur with inversion of configuration, with a stereoselectivity in excess of 94%. The simplest interpretation of this result is that the phosphoryl group is transferred between substrates in the enzyme-substrate ternary complex by an 'in line' mechanism.

Original publication




Journal article


The Biochemical journal

Publication Date





227 - 233


Saccharomyces cerevisiae, Oxygen Isotopes, Hexokinase, Adenosine Triphosphate, Thionucleotides, Affinity Labels, Magnetic Resonance Spectroscopy, Molecular Conformation, Phosphorylation