Four casein kinase I isoforms are differentially partitioned between nucleus and cytoplasm.

Abstract:

:The casein kinase I (CKI) family consists of at least seven vertebrate genes, some of which can be alternatively spliced. Previously, we have studied the four splice variants of the chicken CKIalpha gene. The four proteins differ only by the presence or absence of two peptides, a 28-amino-acid "L" insert in the catalytic domain and a 12-amino-acid "S" insert near the extreme C-terminus. Here cells were transfected with DNA encoding all four isoforms fused to the green fluorescent protein (GFP) and the localization of each protein was examined. We noted that the L insert includes the sequence PVGKRKR, which has the characteristics of a nuclear localization signal (NLS), and we show that the CKIalphaL and CKIalphaLS isoforms which contain this sequence are targeted to the nucleus, where a fraction becomes associated with nuclear speckles. In contrast the two isoforms lacking the L insert remain predominantly cytoplasmic. Mutation of the first lysine in the putative NLS to asparagine prevented the nuclear entry of GFP-CKIalphaL. Therefore different CKIalpha isoforms are targeted to different cellular compartments in a fashion modulated by alternate transcription and in these locations presumably phosphorylate and regulate different cellular substrates.

journal_name

Exp Cell Res

authors

Fu Z,Chakraborti T,Morse S,Bennett GS,Shaw G

doi

10.1006/excr.2001.5324

keywords:

subject

Has Abstract

pub_date

2001-10-01 00:00:00

pages

275-86

issue

2

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(01)95324-8

journal_volume

269

pub_type

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