Phage display technology is used to select and identify peptides, monoclonal antibodies, or proteins that bind to a specific target molecule. The technique involves genetically engineering bacteriophages to display random sequences on the viral coat proteins, creating libraries that typically contain 109–1010 different phage clones.
Phage Display Peptide Libraries
Phage display peptide libraries are collections of bacteriophage particles, each displaying a unique peptide sequence on their surface. These libraries are used in biopanning experiments to identify peptides that bind with high affinity and specificity to a target molecule of interest.
Linear Peptides
Linear peptide phage display libraries display unconstrained peptide sequences on the phage surface. These libraries are ideal for identifying peptides that bind to targets through extended, flexible conformations and are well-suited for initial screening campaigns. Cell Origins offers linear peptide libraries based on the f3TR1, f88-4, and fUSE5 vector systems.
Cyclic Peptides
Cyclic peptide libraries constrain the displayed peptide in a loop conformation through disulfide bonds between flanking cysteine residues. This constraint often results in higher binding affinity and improved metabolic stability compared to linear peptides, making cyclic libraries particularly valuable for drug discovery applications.
Phage Display Antibody Libraries
Phage display antibody libraries display antibody fragments — typically single-chain variable fragments (scFv) or Fab fragments — on the surface of bacteriophage particles. These libraries are used to identify antibodies with high affinity and specificity for a target antigen and are a cornerstone of therapeutic antibody discovery.
Full-Length Monoclonal Antibodies
While traditional phage display is limited to antibody fragments, advances in phage display technology have enabled the display and selection of full-length monoclonal antibodies. These approaches combine the diversity of phage display with the functionality of full-length antibodies for therapeutic applications.
Custom Phage Display Libraries & Expert Support
Need a phage display library that's more tailored to your needs? Cell Origins offers custom peptide and antibody libraries built with your exact requirements in mind. Our team works closely with you to develop advanced, application-specific phage display libraries that maximize success in selection, screening, and downstream development. Contact us to discuss your project.
