The E3 ligase BRUTUS facilitates degradation of VOZ1/2 transcription factors

Plant Cell Environ. 2018 Oct;41(10):2463-2474. doi: 10.1111/pce.13363. Epub 2018 Jul 16.

Abstract

BRUTUS (BTS) is an iron binding E3 ligase that has been shown to bind to and influence the accumulation of target basic helix-loop-helix transcription factors through 26S proteasome-mediated degradation in Arabidopsis thaliana. Vascular Plant One-Zinc finger 1 (VOZ1) and Vascular plant One-Zinc finger 2 (VOZ2) are NAM, ATAF1/2 and CUC2 (NAC) domain transcription factors that negatively regulate drought and cold stress responses in plants and have previously been shown to be degraded via the 26S proteasome. However, the mechanism that initializes this degradation is unknown. Here, we show that BTS interacts with VOZ1 and VOZ2 and that the presence of the BTS RING domain is essential for these interactions. Through cell-free degradation and immunodetection analyses, we demonstrate that BTS facilitates the degradation of Vascular plant One-Zinc finger 1/2 (VOZ1/2) protein in the nucleus particularly under drought and cold stress conditions. In addition to its known role in controlling the iron-deficiency response in plants, here, we report that BTS may play a role in drought and possibly other abiotic stress responses by facilitating the degradation of transcription factors, VOZ1/2.

Keywords: Arabidopsis thaliana; BRUTUS; VOZ1/2; abiotic stress; ubiquitin-proteasome system.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Arabidopsis / enzymology
  • Arabidopsis / metabolism*
  • Arabidopsis Proteins / metabolism
  • Arabidopsis Proteins / physiology*
  • Basic Helix-Loop-Helix Transcription Factors / metabolism*
  • Blotting, Western
  • FMN Reductase / metabolism
  • Immunoprecipitation
  • Plant Roots / metabolism
  • Real-Time Polymerase Chain Reaction
  • Stress, Physiological
  • Subcellular Fractions / metabolism
  • Transcription Factors / metabolism*
  • Ubiquitin-Protein Ligases / metabolism
  • Ubiquitin-Protein Ligases / physiology*

Substances

  • Arabidopsis Proteins
  • Basic Helix-Loop-Helix Transcription Factors
  • Transcription Factors
  • VOZ1 protein, Arabidopsis
  • VOZ2 protein, Arabidopsis
  • FMN Reductase
  • ferric citrate iron reductase
  • BRUTUS protein, Arabidopsis
  • Ubiquitin-Protein Ligases