Isolation of a dinoflagellate mitotic cyclin by functional complementation in yeast.

Abstract:

:Dinoflagellates are protists with permanently condensed chromosomes that lack histones and whose nuclear membrane remains intact during mitosis. These unusual nuclear characters have suggested that the typical cell cycle regulators might be slightly different than those in more typical eukaryotes. To test this, a cyclin has been isolated from the dinoflagellate Gonyaulax polyedra by functional complementation in cln123 mutant yeast. This GpCyc1 sequence contains two cyclin domains in its C-terminal region and a degradation box typical of mitotic cyclins. Similar to other dinoflagellate genes, GpCyc1 has a high copy number, with approximately 5000 copies found in the Gonyaulax genome. An antibody raised against the N-terminal region of the GpCYC1 reacts with a 68kDa protein on Western blots that is more abundant in cell cultures enriched for G2-phase cells than in those containing primarily G1-phase cells, indicating its cellular level follows a pattern expected for a mitotic cyclin. This is the first report of a cell cycle regulator cloned and sequenced from a dinoflagellate, and our results suggest control of the dinoflagellate cell cycle will be very similar to that of other organisms.

authors

Bertomeu T,Morse D

doi

10.1016/j.bbrc.2004.09.008

subject

Has Abstract

pub_date

2004-10-29 00:00:00

pages

1172-83

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(04)02030-3

journal_volume

323

pub_type

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