Dissociation of retinoblastoma gene protein hyperphosphorylation and commitment to enter S phase.

Abstract:

:Mitogenic activities of simian virus 40 large T and small t antigens were studied in serum-deprived human diploid fibroblasts. Wild-type large T and small t cooperated in stimulating DNA synthesis and in inducing hyperphosphorylation of the Rb gene product (pRb). In contrast, a T antigen mutant defective for pRb binding (Rb- T) possessed no detectable mitogenic activity alone and failed to complement small t in stimulating DNA synthesis. Surprisingly, Rb- T and small t cooperated as strongly as wild-type T and small t with respect to pRb hyperphosphorylation. As a consequence, in two closely related conditions (i.e., stimulation by small t plus wild-type T versus small t plus Rb- T), the fraction of pRb in hyperphosphorylated forms dissociated from the fraction of cells in the S phase. These results indicate that pRb hyperphosphorylation is not always tightly coupled with a commitment to initiate DNA replication.

journal_name

J Virol

journal_title

Journal of virology

authors

Ogryzko VV,Hirai TH,Shih CE,Howard BH

doi

10.1128/JVI.68.6.3724-3732.1994

subject

Has Abstract

pub_date

1994-06-01 00:00:00

pages

3724-32

issue

6

eissn

0022-538X

issn

1098-5514

journal_volume

68

pub_type

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