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Journal of Cell Science, Vol 86, Issue 1 207-215, Copyright © 1986 by Company of Biologists

JOURNAL ARTICLES

Nucleoside diphosphokinase, an enzyme with step changes in activity during the cell cycle of the fission yeast Schizosaccharomyces pombe. I. Persistence of steps after a block to the DNA-division cycle

J Creanor and JM Mitchison
Department of Zoology, University of Edinburgh, Scotland.

In confirmation of earlier results, nucleoside diphosphokinase is shown to be a 'step' enzyme in Schizosaccharomyces pombe with a sharp doubling in activity at the beginning of the cell cycle. These doubling steps occur at the same time in the cycle in the smaller cells of the mutant wee1.6. An important result is that the activity steps persist with normal cell cycle timing after a block to the DNA-division cycle imposed by the cycle mutants cdc2.33 and cdc2.33wee1.6. This is clear proof that oscillatory controls of some cell cycle events can persist after the main periodic events of the DNA-division cycle have been abolished.


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© The Company of Biologists Ltd 1986