Identification and properties of an atypical catalytic subunit (p34PSK-J3/cdk4) for mammalian D type G1 cyclins

作者: Hitoshi Matsushime , Mark E. Ewen , David K. Strom , Jun-Ya Kato , Steven K. Hanks

DOI: 10.1016/0092-8674(92)90360-O

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摘要: Abstract Murine D type cyclins associate with a catalytic subunit (p34 PSK-J3 ) properties distinct from known cyclin-dependent kinases (cdks). Mouse p34 shows less than 50% amino acid identity to cdc2 , p33 cdk2 and p36 cdk3 lacks PSTAIRE motif, does not bind p13 suc1 . Cyclin D1-p34 complexes accumulate in macrophages during G1 decline S phase, whereas involving D2 D3 form proliferating T cells. Although histone H1 kinase activity is detected cyclin or immunoprecipitates, D-p34 assembled vitro stably phosphorylate the retinoblastoma gene product (pRb) an Rb-like protein (p 107) but do interact pRb mutants that are functionally inactive. Thus, D-regulated acts as Rb (but H1) kinase.

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