Related Experiment Video
Updated: Jul 18, 2026

Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
Published on: October 14, 2022
Multifunctional arm repeat domains in plants
Marcus A Samuel1, Jennifer N Salt, Shin-Han Shiu
1Department of Botany, University of Toronto, Toronto, Ontario, Canada M5S 3B2.
Abstract:
Arm repeat domains are composed of multiple 42 amino acid Arm repeats and are found in the proteomes of all eukaryotic organisms. The Arm repeat domain is a highly conserved right-handed super helix of alpha-helices involved in protein-protein interactions. The well-characterized Arm repeat proteins in animal and plants are known to function in diverse cellular processes including signal transduction, cytoskeletal regulation, nuclear import, transcriptional regulation, and ubiquitination. While Arm repeat domains are found in all eukaryotes, plants have evolved some unique domain organizations, such as the U-box and Arm repeat domain combination, with specialized functions. The plant-specific U-box/Arm repeat proteins are the largest family of Arm repeat proteins in all the genomes surveyed, and more recent data have implicated these proteins as E3 ubiquitin ligases. While functions have not been assigned for most of the plant Arm repeat proteins, recent studies have demonstrated their importance in multiple processes such as self-incompatibility, hormone signaling, and disease resistance.
Related Concept Videos
Cell Signaling in Plants
Conservation of Protein Domains Over Different Proteins
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
Protein Complexes with Interchangeable Parts
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Restarting Stalled Replication Forks
Conservative Site-specific Recombination and Phase Variation
The recognition sites for Cre recombinase called LoxP...
Riboswitches
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...

