Abstract
Lanthanide metal(III) ions remarkably catalyze the hydrolysis of phosphodiester linkages in DNA, RNA, and adenosine 3', 5'-cyclic phosphate. The magnitudes of acceleration range from 106 to 10" fold. With the use of Ce(III) ion (0.01 m oldm-3), the phosphodiester linkages in linear DNAs are hydrolyzed for the first time nonenzymatically (half-life 3.6 h at pH 7.2, 50 °C). Furthermore, the linkages in both RNA and adenosine 3', 5'-cyclic phosphate are efficiently hydrolyzed at pH 8.0, 30 °C with the half-lives 10 m in (by Tm(III)) and 36seconds (by Ce(III)), respectively. Non-lanthanide metal ions show virtually no catalysis: the superb catalysis is specific for lanthanide metal ions. These results indicate high potentialities of the metal ions as the catalytic centers for the artificial enzymes which are ap plicable to regulation of various bio-reactions.
