The dual role of LESION SIMULATING DISEASE 1 as a condition-dependent scaffold protein and transcription regulator

Plant Cell Environ. 2017 Nov;40(11):2644-2662. doi: 10.1111/pce.12994. Epub 2017 Jul 26.


Since its discovery over two decades ago as an important cell death regulator in Arabidopsis thaliana, the role of LESION SIMULATING DISEASE 1 (LSD1) has been studied intensively within both biotic and abiotic stress responses as well as with respect to plant fitness regulation. However, its molecular mode of action remains enigmatic. Here, we demonstrate that nucleo-cytoplasmic LSD1 interacts with a broad range of other proteins that are engaged in various molecular pathways such as ubiquitination, methylation, cell cycle control, gametogenesis, embryo development and cell wall formation. The interaction of LSD1 with these partners is dependent on redox status, as oxidative stress significantly changes the quantity and types of LSD1-formed complexes. Furthermore, we show that LSD1 regulates the number and size of leaf mesophyll cells and affects plant vegetative growth. Importantly, we also reveal that in addition to its function as a scaffold protein, LSD1 acts as a transcriptional regulator. Taken together, our results demonstrate that LSD1 plays a dual role within the cell by acting as a condition-dependent scaffold protein and as a transcription regulator.

Keywords: Arabidopsis thaliana; LSD1; dry weight; oxidative stress; protein interaction; transcription regulation.

MeSH terms

  • Arabidopsis / cytology
  • Arabidopsis / genetics*
  • Arabidopsis / growth & development
  • Arabidopsis Proteins / metabolism*
  • Carboxylic Ester Hydrolases / metabolism
  • Cell Count
  • Cell Nucleus / metabolism
  • DNA-Binding Proteins / metabolism*
  • Gene Expression Regulation, Plant
  • Oxidation-Reduction
  • Oxidative Stress
  • Promoter Regions, Genetic / genetics
  • Protein Binding
  • Protein Interaction Maps
  • Protein Multimerization
  • Transcription Factors / metabolism*
  • Transcription, Genetic*


  • Arabidopsis Proteins
  • DNA-Binding Proteins
  • EDS1 protein, Arabidopsis
  • LSD1 protein, Arabidopsis
  • Transcription Factors
  • Carboxylic Ester Hydrolases
  • PAD4 protein, Arabidopsis