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Nucleic Acids Research, Vol 24, Issue 5 850-853, Copyright © 1996 by Oxford University Press

ARTICLES

Diastereomeric specificity of 2',3'-cyclic nucleotide 3'- phosphodiesterase

PA Heaton and F Eckstein
Max-Planck-Institut fur experimentelle Medizin, Gottingen, Germany.

The diastereomers of adenosine and uridine 2',3'-cyclic phosphorothioates were tested as substrates for 2',3'-cyclic nucleotide 3'-phosphodiesterase from bovine brain. The enzyme cleaves the Sp (or exo) diastereomers efficiently, whereas the Rp (or endo) diastereomers are resistant to hydrolysis, even after long incubation. As the enzyme exhibits strong substrate inhibition the precise determination of kinetic parameters posed problems, particularly with phosphorothioates. The stereoselectivity of this enzyme is opposite to that of RNase T1 and RNase A and thus could be a useful complement in determination of the configuration of nucleoside 2',3'-cyclic phosphorothioates resulting from hydrolysis reactions of unknown stereochemical course.
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