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Journal of Cell Science, Vol 73, Issue 1 7-18, Copyright © 1985 by Company of Biologists

JOURNAL ARTICLES

Enzymic ribonucleoside reduction at the non-phosphorylated level in Acetabularia

EJ de Groot and HG Schweiger

The occurrence of an enzyme that catalyses the conversion of cytidine into deoxycytidine was demonstrated in homogenates of Acetabularia. Cytidine was identified as the substrate by comparing cytidine, cytidine 5'-monophosphate, cytidine 5'-diphosphate and cytidine 5'-triphosphate as potential substrates. Experiments with ATP analogues whose inhibitory effect on kinase reactions is well established, supplied evidence that the nucleoside is reduced without a phosphorylation step before the reduction. Further evidence in this line came from incubations with cytidine in the presence of phosphatase and from trap-type experiments in which the effects of excess non-labelled cytidine 5'-phosphate and deoxycytidine, respectively, on the formation of deoxycytidine phosphates from cytidine were studied.


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L. Runft and D. Mandoli
Coordination of cellular events that precede reproductive onset in Acetabularia acetabulum: evidence for a 'loop' in development
Development, January 4, 1996; 122(4): 1187 - 1194.
[Abstract] [PDF]


© The Company of Biologists Ltd 1985