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Interview: Protein Folding and Studies of Neurodegenerative Diseases

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Less Conserved LRRs Is Important for BRI1 Folding.

Qiang Hou¹, Shehzadi Saima¹, Hong Ren²

¹College of Life Sciences, Shaanxi Normal University, Xi'an, China.

Frontiers in Plant Science

|June 6, 2019

Summary

A new Arabidopsis mutant, bri1-235, reveals the function of less conserved LRR domains in Brassinosteroid insensitive 1 (BRI1). This study highlights the importance of LRR domains in plant growth and brassinosteroid signaling.

Keywords:

Arabidopsis BRI1 LRRs endoplasmic reticulum less conserved

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Area of Science:

Plant Biology
Molecular Biology
Genetics

Background:

Brassinosteroid insensitive 1 (BRI1) is a plant leucine-rich repeat receptor-like kinase (LRR-RLK) crucial for brassinosteroid (BR) signaling.
The kinase domain (KD) and island domain (ID) of BRI1 are highly conserved, with most mutants affecting these regions.
The function of less conserved LRR domains in BRI1 remains largely unknown.

Purpose of the Study:

To investigate the role of less conserved LRR domains in BRI1 function.
To characterize a novel loss-of-function mutant, bri1-235, affecting the fourth LRR of BRI1.

Main Methods:

Identification and characterization of the bri1-235 loss-of-function mutant in Arabidopsis.
Analysis of phenotypic changes, BR sensitivity, BRI1 expression, and protein localization.
Complementation studies using wild-type BRI1 and a BRI1-activating mutant (sbi1).

Main Results:

The bri1-235 mutant exhibits altered phenotypes including round leaves, shorter stature, and reduced BR sensitivity.
The bri1-235 mutation results in mislocalization of the BRI1 protein to the endoplasmic reticulum instead of the plasma membrane.
Complementation with wild-type BRI1 or sbi1 rescued the bri1-235 phenotypes.

Conclusions:

Less conserved LRR domains of BRI1 play a significant role in BR perception and signaling.
Proper localization of BRI1 to the plasma membrane is essential for its function.
This study provides insights into the broader roles of LRR domains in LRR-RLKs involved in plant development and stress response.