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J Biol Chem, Vol. 273, Issue 11, 6190-6195, March 13, 1998
From the We have observed that cyclin
D3-dependent kinase activity is increased in the late
G1 phase in BALB/c 3T3 fibroblasts. The profile of
cyclin D3-associated activity closely parallels that of cyclin D1,
which is also induced after mitogenic stimulation of quiescent cells.
These activities correlate with the appearance of hyperphosphorylated
p130, an Rb family member important in regulating E2F-4 and E2F-5
activity in fibroblastic cells. We demonstrated, however, that only the
cyclin D3 activity efficiently phosphorylated p130 in an in
vitro kinase assay. This apparent specificity was further
demonstrated by experiments which demonstrated that cyclin D3 was
physically associated with p130 at the times when
D3-dependent kinase activity and p130 hyperphosphorylation were observed. Examination of E2F by electrophoretic mobility shift
assay revealed that E2F-4 DNA binding activity existed in a p130·E2F
complex at times before D3-dependent kinase activity was
apparent and in a free E2F-4 complex after D3 activity developed. Thus,
our data suggest that cyclin D3 preferentially phosphorylates p130 and
is thereby specifically targeted to overcoming growth-suppressive control mediated through p130 pathways.
The Role of Cyclin D3-dependent Kinase in the
Phosphorylation of p130 in Mouse BALB/c 3T3 Fibroblasts
§,
¶,
§, and
¶
H. Lee Moffitt Cancer Center and Research
Institute and the § Department of Medical Microbiology and
Immunology and ¶ Department of Biochemistry and Molecular Biology
College of Medicine, University of South Florida,
Tampa, Florida 33612
Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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