The Arabidopsis SPFH protein HIR2 modulates receptor signaling and plasma membrane organization.

Arabidopsis HIR2 modulates receptor signaling and plasma membrane organization by affecting BAK1 mobility and clustering, as shown by sptPALM analysis.

• Why it matters: Understanding how plant plasma membrane proteins are organized is crucial for revealing mechanisms of membrane dynamics and receptor function, which are not yet fully understood.
• What they did: Researchers investigated HIR2, a plant-specific SPFH family protein, using interaction studies, mutant phenotyping, structural modeling, and advanced microscopy to explore its role in membrane organization.
• The result: HIR2 influences BAK1 mobility and clustering, contributes to membrane sub-compartment formation, and may serve as a structural framework for spatial membrane organization affecting receptor dynamics and signaling.