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. 1987 Mar;84(6):1575–1579. doi: 10.1073/pnas.84.6.1575

Cloning and sequence of the human nuclear protein cyclin: homology with DNA-binding proteins.

J M Almendral, D Huebsch, P A Blundell, H Macdonald-Bravo, R Bravo
PMCID: PMC304478  PMID: 2882507

Abstract

A full-length cDNA clone for the human nuclear protein cyclin has been isolated by using polyclonal antibodies and sequenced. The sequence predicts a protein of 261 amino acids (Mr 29,261) with a high content of acidic (41, aspartic and glutamic acids) versus basic (24, lysine and arginine) amino acids. The identity of the cDNA clone was confirmed by in vitro hybrid-arrested translation of cyclin mRNA. Blot-hybridization analysis of mouse 3T3 and human MOLT-4 cell RNA revealed a mRNA species of approximately the same size as the cDNA insert. Expression of cyclin mRNA was undetectable or very low in quiescent cells, increasing after 8-10 hr of serum stimulation. Inhibition of DNA synthesis by hydroxyurea in serum-stimulated cells did not affect the increase in cyclin mRNA but inhibited 90% the expression of H3 mRNA. These results suggest that expression of cyclin and histone mRNAs are controlled by different mechanisms. A region of the cyclin sequence shows a significant homology with the putative DNA binding site of several proteins, specially with the transcriptional-regulator cAMP-binding protein of Escherichia coli, suggesting that cyclin could play a similar role in eukaryotic cells.

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Selected References

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