A Rapid and Simplified Method to Isolate Specific Regulators Based on Biotin-Avidin Binding Affinities in Crops

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• Transcription factors (TFs) are crucial for regulating gene expression in crops.
• Identifying specific TFs that control crop growth and development is essential for agricultural advancements.

Purpose of the Study:

• To develop and validate a novel DNA-based biotin and avidin system (DBAS) for identifying upstream transcription factors in crops.
• To screen and identify regulators of the rice OsNRT1.1B gene using the developed DBAS method.

Main Methods:

• Construction and verification of a biotin and avidin system (BAS) using coprecipitation assays.
• Demonstration of DNA-based BAS (DBAS) feasibility through in vivo and in vitro assays.
• Cloning of the rice OsNRT1.1B promoter and screening for potential regulatory factors.
• Validation of candidate regulators using electrophoresis mobility shift assay (EMSA), yeast one-hybrid, and luciferase activity assays.

Main Results:

• The novel DBAS method was successfully established and validated for TF identification in crops.
• The rice OsNRT1.1B promoter was analyzed, and candidate regulators PIP3 and PIP19 were identified.
• PIP3 and PIP19 were confirmed to respond rapidly to nitrate, with PIP3 overexpression inhibiting growth, indicating their functional roles.

Conclusions:

• The developed DBAS method is effective for isolating functional transcription factors regulating specific genes in crops.
• The identified regulators PIP3 and PIP19 play significant roles in plant response to nitrate and overall growth.