The Arabidopsis Thaliana Homolog of Yeast BRE1 Has a Function in Cell Cycle Regulation During Early Leaf and Root Growth

Overview

Journal Plant Cell

Publisher Oxford University Press

Specialties Biology
Cell Biology

Date 2007 Mar 3

PMID 17329565

Citations 73

Authors

Delphine Fleury

Kristiina Himanen

Gerda Cnops

Hilde Nelissen

Tommaso Matteo Boccardi

Steven Maere

Gerrit T S Beemster

Pia Neyt

Sylvester Anami

Pedro Robles

Jose Luis Micol

Dirk Inze

Mieke Van Lijsebettens

Affiliations

Soon will be listed here.

Abstract

Chromatin modification and transcriptional activation are novel roles for E3 ubiquitin ligase proteins that have been mainly associated with ubiquitin-dependent proteolysis. We identified HISTONE MONOUBIQUITINATION1 (HUB1) (and its homolog HUB2) in Arabidopsis thaliana as RING E3 ligase proteins with a function in organ growth. We show that HUB1 is a functional homolog of the human and yeast BRE1 proteins because it monoubiquitinated histone H2B in an in vitro assay. Hub knockdown mutants had pale leaf coloration, modified leaf shape, reduced rosette biomass, and inhibited primary root growth. One of the alleles had been designated previously as ang4-1. Kinematic analysis of leaf and root growth together with flow cytometry revealed defects in cell cycle activities. The hub1-1 (ang4-1) mutation increased cell cycle duration in young leaves and caused an early entry into the endocycles. Transcript profiling of shoot apical tissues of hub1-1 (ang4-1) indicated that key regulators of the G2-to-M transition were misexpressed. Based on the mutant characterization, we postulate that HUB1 mediates gene activation and cell cycle regulation probably through chromatin modifications.

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