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Journal of Cell Science, Vol 107, Issue 6 1519-1528, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
AH Osmani, N van Peij, M Mischke, MJ O'Connell and SA Osmani
Weis Center for Research, Geisinger Clinic, Danville, PA 17822-2617.
We have cloned and sequenced a homolog of cdc2 from Aspergillus nidulans that can complement the Schizosaccharomyces pombe cdc2-33 mutation. The gene was deleted and is required for continued nuclear DNA replication but not for mitochondrial DNA replication. Three different temperature-sensitive alleles were generated by reverse genetics. All of the mutations generate the nim phenotype of A. nidulans. The new gene was designated nimXcdc2 as it is not allelic to any of the other nim genes (nimA to nimW) of A. nidulans. Reciprocal shift experiments place an essential function for nimXcdc2 in G1 and G2. Antipeptide antibodies were generated that detect NIMXcdc2, and antisera were also generated to detect NIMEcyclinB. The two p34cdc2 protein species previously detected in A. nidulans, p34 and p37, both precipitate using NIMXcdc2 C-terminus-specific antibodies but only p34 co-precipitates with NIMEcyclinB. Dephosphorylation of denatured p34 converts it to the p37 form, showing p37 to be the non-phosphorylated form of NIMXcdc2. The phosphorylation of p34 is therefore associated with its interaction with NIMEcyclinB.
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