RING-Between-RING-Type E3 Ligase Ariadne-Like Protein 8 Negatively Regulates Plant Virus Infection by Targeting a Viral Movement Protein.

The ubiquitin-proteasome system is a highly conserved machinery that plays a crucial role in plant defense against viruses. However, the number of E3 ligases targeting viral proteins remains limited. Although RING-between-RING (RBR)-type E3 ligases are evolutionarily conserved across organisms, their functions in plant responses to biotic stress remain largely unknown.

A cell wall-associated kinase phosphorylates NLR immune receptor to negatively regulate resistosome formation.

Plants deploy intracellular nucleotide-binding leucine-rich repeats (NLRs) to detect pathogen effectors and initiate immune responses. Although the activation mechanism of some plant NLRs forming resistosomes has been elucidated, whether NLR resistosome assembly is regulated to fine-tune immunity remains enigmatic. Here we used an antiviral coiled coil-nucleotide-binding site-leucine rich repeat, Barley Stripe Resistance 1 (BSR1), as a model and demonstrate that BSR1 is phosphorylated.

Orchestrating ROS regulation: coordinated post-translational modification switches in NADPH oxidases.

Reactive oxygen species (ROS) are among the most important signaling molecules, playing a significant role in plant growth, development, and responses to various environmental stresses. Respiratory burst oxidase homologs (RBOHs) are key enzymes in ROS production. Plants tightly regulate the activation and deactivation of RBOHs through various post-translational modifications (PTMs), including phosphorylation, ubiquitination, S-nitrosylation, and persulfidation.

The CC-NB-LRR protein BSR1 from Brachypodium confers resistance to Barley stripe mosaic virus in gramineous plants by recognising TGB1 movement protein.

Although some nucleotide binding, leucine-rich repeat immune receptor (NLR) proteins conferring resistance to specific viruses have been identified in dicot plants, NLR proteins involved in viral resistance have not been described in monocots. We have used map-based cloning to isolate the CC-NB-LRR (CNL) Barley stripe mosaic virus (BSMV) resistance gene barley stripe resistance 1 (BSR1) from Brachypodium distachyon Bd3-1 inbred line. Stable BSR1 transgenic Brachypodium line Bd21-3, barley (Golden Promise) and wheat (Kenong 199) plants developed resistance against BSMV ND18 strain.

Tobacco Necrosis Virus-A Single Coat Protein Amino Acid Substitutions Determine Host-Specific Systemic Infections of and Soybean.

Plant viruses often infect several distinct host species. Sometimes, viruses can systemically infect a specific host whereas, in other cases, only local infections occur in other species. How viral and host factors interact to determine systemic infections among different hosts is largely unknown, particularly for icosahedral positive-stranded RNA viruses.