Discrimination between the activity of protein kinase CK2 holoenzyme and its catalytic subunits.

Abstract:

:The acronym CK2 denotes a highly pleiotropic Ser/Thr protein kinase whose over-expression correlates with neoplastic growth. A vexed question about the enigmatic regulation of CK2 concerns the actual existence in living cells of the catalytic (alpha and/or alpha') and regulatory beta-subunits of CK2 not assembled into the regular heterotetrameric holoenzyme. Here we take advantage of novel reagents, namely a peptide substrate and an inhibitor which discriminate between the holoenzyme and the catalytic subunits, to show that CK2 activity in CHO cells is entirely accounted for by the holoenzyme. Transfection with individual subunits moreover does not give rise to holoenzyme formation unless the catalytic and regulatory subunits are co-transfected together, arguing against the existence of free subunits in CHO cells.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Salvi M,Sarno S,Marin O,Meggio F,Itarte E,Pinna LA

doi

10.1016/j.febslet.2006.06.031

subject

Has Abstract

pub_date

2006-07-10 00:00:00

pages

3948-52

issue

16

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(06)00738-1

journal_volume

580

pub_type

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