A versatile puromycin-linker using cnvK for high-throughput in vitro selection by cDNA display

Area of Science:

• Biotechnology
• Molecular Biology
• Biochemistry

Background:

• cDNA display is a key in vitro technology for identifying functional peptides and proteins from large libraries.
• Efficient analysis of selected clones is vital for high-throughput screening in protein and peptide discovery.

Purpose of the Study:

• To introduce a versatile puromycin-linker with an ultrafast photo-cross-linker (3-cyanovinylcarbazole nucleoside).
• To demonstrate its utility in both cDNA display selection and surface plasmon resonance (SPR) based protein-protein interaction analysis.

Main Methods:

• Development and application of a novel puromycin-linker incorporating 3-cyanovinylcarbazole nucleoside.
• In vitro selection using the modified cDNA display system.
• Surface plasmon resonance (SPR) assays for measuring binding kinetics.

Main Results:

• Successful demonstration of in vitro selection for the FLAG epitope using the new linker.
• Accurate measurement of the dissociation constant between protein A's B domain and immunoglobulin G via SPR.
• The puromycin-linker facilitates both selection and functional analysis.

Conclusions:

• The developed puromycin-linker improves the efficiency of cDNA display for selecting functional molecules.
• This advancement simplifies the design and discovery of protein or peptide-based affinity reagents.
• The linker enables rapid functional analysis, crucial for high-throughput screening applications.