Regulation of the localization and stability of Cdc6 in living yeast cells.

Abstract:

:The Cdc6 protein is an essential regulator for initiation of DNA replication. Following the G1/S transition, Cdc6 is degraded through a ubiquitin-mediated proteolysis pathway. In this study, we tagged Cdc6 with green fluorescent protein (GFP) and used site-specific mutations to study the regulation of Cdc6 localization and degradation in living yeast cells. Our major findings are: (1). Cdc6-GFP distributes predominantly in the nucleus in all cell cycle stages, with a small increase in cytoplasmic localization in G2/M cells. (2). This nuclear localization is critical for Cdc6 degradation. When the N-terminal nuclear localization signal (NLS) was mutated, Cdc6-GFP no longer accumulated in the nucleus, and the mutant cdc6 was stabilized compared to wild type. (3). The putative CDK phosphorylation sites are not required for Cdc6 nuclear localization, but are important for protein stability. These observations suggest that the stability of Cdc6 protein is regulated by two factors: nuclear localization and phosphorylation by CDK1.

authors

Luo KQ,Elsasser S,Chang DC,Campbell JL

doi

10.1016/s0006-291x(03)01082-9

subject

Has Abstract

pub_date

2003-07-11 00:00:00

pages

851-9

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006291X03010829

journal_volume

306

pub_type

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