Arabidopsis RETINOBLASTOMA-RELATED PROTEIN 1 is Involved in G1 Phase Cell Cycle Arrest Caused by Sucrose Starvation

Overview

Journal Plant Mol Biol

Date 2007 Dec 8

PMID 18064404

Citations 17

Authors

Hiroto Hirano

Hirofumi Harashima

Atsuhiko Shinmyo

Masami Sekine

Affiliations

Soon will be listed here.

Abstract

Although sucrose availability is crucial for commitment to plant cell division during G1 phase by controlling the expression of D-type cyclins, it has remained unclear how these factors mediate entry into the cell cycle. Here we show that Arabidopsis RETINOBLASTOMA-RELATED PROTEIN 1 (AtRBR1) is involved in G1-phase cell cycle arrest caused by sucrose starvation. We generated estrogen-inducible AtRBR1 RNA interference (RNAi) Arabidopsis suspension MM2d cells, and found that downregulation of AtRBR1 leads to a higher frequency of arrest in G2 phase, instead of G1-phase arrest in the uninduced control, after sucrose starvation. Synchronization experiments confirmed that downregulation of AtRBR1 leads to a prolonged G2 phase and delayed activation of G2/M marker genes. Downregulation of AtRBR1 also stimulated the activation of E2F-regulated genes when these genes were repressed in the uninduced cells under the limited sucrose conditions. We conclude that AtRBR1 is a key effector for the ability of sucrose to modulate progression from G1 phase.

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