Mapping transcription factor interactome networks using HaloTag protein arrays

Area of Science:

• Plant Biology
• Molecular Biology
• Biochemistry

Background:

• Protein microarrays offer high-throughput analysis of protein functions.
• Understanding transcription factor interactions is crucial for plant hormone signaling.

Purpose of the Study:

• To create a comprehensive transcription factor interactome network for plant hormone pathways.
• To identify novel protein-protein interactions using a high-density protein array system.

Main Methods:

• Developed high-density protein arrays with 12,000 Arabidopsis ORFs using HaloTag nucleic acid programmable protein array (HaloTag-NAPPA) technology.
• Queried protein-protein interactions for 38 transcription factors (TFs) involved in plant hormone pathways.
• Validated interactions using in vitro pull-down assays and in planta bimolecular fluorescence complementation (BiFC) assays.

Main Results:

• Generated the TF-NAPPA network, revealing thousands of novel transcription factor interactions.
• Validated 64% of novel interactions, comparable to literature-curated sets.
• Confirmed several biologically relevant interactions in planta and determined their localization.

Conclusions:

• HaloTag-NAPPA technology is effective for building proteome-wide interactome networks.
• The study identified numerous novel TF interactions critical for plant hormone signaling.
• Developed a valuable resource for plant hormone research.