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3H1 (anomeric carbon) bond of adenosine in V/K isotope effect measurements. At five bonds remote from the site of chemistry, and differing for the three enzymes reported here, this remote effect has the hallmarks of a BIE. Not previously appreciated, this effect may have its origin in the glycosyl torsion angle between the purine and the ribosyl group, making it of potential use in reactions involving nucleic acids.
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