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Contact inhibition-induced inactivation of the cyclin D-dependent kinase in rat fibroblast cell line, 3Y1.

Abstract：

:Inhibitory proteins for Cdks (CKIs) are involved in cell cycle arrest induced by anti-mitotic factors, chemicals, or DNA damage in mammalian cells. High cell density also induces cell cycle arrest with unreplicated genomic DNA even in the presence of mitotic dose of the growth factors, termed contact inhibition. Although rat fibroblast cell line, 3Y1, arrested in quiescence by contact inhibition, Cdk4 bound its regulatory subunit, cyclin D1 or D3. However, these complexes were enzymatically inactive. Phosphorylation of the cyclin D1-bound Cdk4 by Cdk4-activating kinase, composed of cyclin H and MO15 (alias Cdk7), which was reconstituted in Spodoptera frugiperda cells (Sf9) could convert inactive cyclin D1-Cdk4 complex into active form in vitro, suggesting that threonine 172 in the Cdk4, whose phosphorylation is required for its activation, was in part unphosphorylated in the contact-inhibited 3Y1. Although MO15 was active in cell extracts prepared from the contact-inhibited 3Y1, activation of bacterially produced Cdk4 in the cell extracts was inhibited. Removing p27kip1 from the cell extracts allowed MO15 holoenzyme to phosphorylate the Cdk4 and to activate it, indicating that an access of MO15 to Cdk4 was inhibited by p27kip1 in the contact-inhibited 3Y1.

journal_name

Leukemia

journal_title

Leukemia

authors

Kato A,Takahashi H,Takahashi Y,Matsushime H

subject

Has Abstract

pub_date

1997-04-01 00:00:00

pages

361-2

eissn

0887-6924

issn

1476-5551

journal_volume

11 Suppl 3

pub_type

杂志文章

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