ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets.

ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Research Abstract Details 

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ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Abstract Text:

Jessie Villanueva,Yuval Yung,Janice L Walker,Richard K Assoian,

The ERK subfamily of MAP kinases is a critical regulator of S phase entry. ERK activity regulates the induction of cyclin D1, and a sustained ERK signal is thought to be required for this effect, at least in fibroblasts. We now show that early G1 phase ERK activity is dispensable for the induction of cyclin D1 and that the critical ERK signaling period is restricted to 3-6 h after mitogenic stimulation of quiescent fibroblasts. Similarly, early G1 phase ERK activity is dispensable for entry into S phase. Moreover, if cyclin D1 is expressed ectopically, ERK activity becomes dispensable throughout the G1 phase. In addition to its effect on cyclin D1, ERK activity is thought to contribute to the down-regulation of p27kip1. We found that this effect is restricted to late G1/S phase. Mechanistic analysis showed that the ERK effect on p27kip1 is mediated by Skp2 and is secondary to its effect on cyclin D1. Our results emphasize the importance of mid-G1 phase ERK activity and resolve primary versus secondary ERK targets within the G1 phase cyclin-dependent kinases.

ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Publishing Authors By Initials

J Villanueva,Y Yung,JL Walker,RK Assoian,

For similar proteins: carrier proteins: s-phase kinase-associated proteins research abstracts see: proteins: carrier proteins: s-phase kinase-associated proteins research

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ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Molecular biology of the cell

VOLUME: 18

Page Numbers: 1457-63

Journal Abbreviation: Mol. Biol. Cell

ISSN: 1059-1524

DAY: 21

MONTH: 02

YEAR: 2007

ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9201390

ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Keywords Mesh Terms:

KEYWORDS: S-Phase Kinase-Associated Proteins

MESH TERMS: metabolism

Chemical & Substance for Abstract: ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets. Information

Substance Name: Extracellular Signal-Regulated MAP Kinas

Registry Number: EC 2.7.1.37

Grant and Affiliation Information for ERK activity and G1 phase progression: identifying dispensable versus essential activities and primary versus secondary targets.

AFFILIATION: Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6084, USA.

Country: United States

AGENCY: United States NCI

GRANT: R25-CA101871

ACRONYM: CA

MEDLINETA: Mol Biol Cell

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