A high-throughput microfluidic method for generating and characterizing transcription factor mutant libraries

Area of Science:

• Molecular Biology
• Biochemistry
• Biotechnology

Background:

• Characterizing mutant proteins, especially transcription factors, presents significant challenges in DNA construct synthesis, host transformation, and scalable purification.
• Existing methods are often not amenable to high-throughput analysis of large protein variant libraries.

Purpose of the Study:

• To develop and present a novel microfluidic platform for the efficient screening and binding profile characterization of numerous transcription factor mutants.
• To overcome the limitations of traditional methods in synthesizing and analyzing large numbers of protein variants.

Main Methods:

• A high-throughput microfluidic platform was employed for on-chip expression and characterization of transcription factor mutants.
• DNA constructs were synthesized using a rapid two-step polymerase chain reaction (PCR) approach, eliminating the need for cloning and transformation.
• Binding specificities of mutant proteins were assessed against 64 distinct DNA target sequences.

Main Results:

• The platform successfully synthesized and characterized up to 2,400 protein-DNA pairs in parallel.
• The method demonstrated high-throughput screening capabilities for hundreds of transcription factor variants.
• Detailed binding profiles for multiple transcription factor mutants were obtained.

Conclusions:

• The described microfluidic platform offers a scalable and efficient solution for characterizing mutant protein libraries, particularly transcription factors.
• This approach facilitates in-depth functional insights into protein variants and is broadly applicable to high-throughput protein studies.