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Papillomavirus binding factor (PBF)-mediated inhibition of cell growth is regulated by 14-3-3beta.

Abstract：

:The cellular factor, papillomavirus (PV)-binding factor (PBF)/Huntington's disease binding protein 2 (HDBP2), was identified by its ability to bind regulatory sequences of certain papillomavirus types as well as the Huntington's disease gene. PBF is thought to be a novel nuclear-shuttling transcription factor with unknown function. To further characterize PBF, we identified 14-3-3beta as an interaction partner. We demonstrated that PBF binds to 14-3-3beta using two motifs. Akt-kinase and an unidentified kinase that are activated by the PI3K-signaling pathway were able to phosphorylate these motifs, allowing PBF to associate with 14-3-3beta. This interaction may contribute to the control of the subcellular localization of PBF, which migrated into the nucleus in the absence of growth factors. Over-expression of PBF resulted in the inhibition of cell growth, which was enhanced using a 14-3-3 binding-deficient PBF mutant. Thus, our experiments characterized PBF as a new cellular factor mediating the effects of PI3K/Akt signaling and 14-3-3 on cell growth.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Sichtig N,Silling S,Steger G

doi

10.1016/j.abb.2007.04.017

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

90-9

issue

1

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(07)00191-9

journal_volume

464

pub_type

杂志文章

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