Phage Library

Phage Library

Phage Library

Phage libraries represent a highly diverse, high-throughput molecular display and screening platform, playing an irreplaceable role in biotechnology, targeted drug discovery, antibody engineering, basic biological research, and other fields. Common display systems and applied libraries mainly include M13 filamentous phage libraries, T7 phage libraries, T4 phage libraries, λ phage libraries, as well as various customized peptide or native antibody libraries targeting specific antigens (e.g., pathogenic bacteria, tumor markers, etc.).

Phage libraries possess unique high-throughput screening characteristics and dedicated application scenarios, demonstrating remarkable advantages in diverse fields:

As a typical non-lytic display vector, M13 filamentous phage is a widely used platform for single-chain antibody (scFv) and peptide display. Owing to the strict linkage between genotype and phenotype, it occupies a central position in innovative targeted drug discovery, antigen epitope identification, and protein–protein interaction network analysis.

T7 phage is a lytic display system characterized by rapid assembly, high copy number, and low restriction on the size of displayed fragments. It can be used not only for the efficient display of macromolecular proteins and cDNA libraries but also shows great potential in targeted delivery vector screening and novel vaccine development.

Native phage libraries customized for specific clinical drug-resistant pathogenic bacteria (e.g., Staphylococcus aureus) feature diverse host ranges and unique bactericidal mechanisms, serving as an indispensable tool in engineered phage chassis screening, targeted CRISPR system delivery for the precise intervention of resistance mechanisms, and the development of novel antibacterial therapies.

λ phage is a classic and highly efficient recombinant display system, as well as an important tool for analyzing the structure and function of complex protein libraries, providing a key model for the artificial evolution of high-affinity ligands.

Customized peptide or nanobody libraries offer diversified application value in in vitro diagnosis, industrial enzyme screening, and cell panning—such as the large-scale discovery of highly specific lead compounds—and also present promising prospects in novel biosensors and related fields.

Service Advantages

(1) Large library capacity: Extremely high library construction efficiency and sequence diversity (conventional peptide/antibody libraries reach 10⁹–10¹¹ or above, and some customized libraries are even larger). Optimized electroporation and packaging procedures ensure high coverage, high affinity, and low redundancy.

(2) High flexibility: Supports multiple display formats, including peptide display, single-domain antibody (VHH), single-chain antibody (scFv), and full-length native protein. Customized targeted screening strategies (e.g., solid-phase panning, solution-phase panning, or whole-cell binding screening) are available to match the physicochemical and structural properties of different target molecules.

(3) Wide applicability: Covers both filamentous and lytic phage display systems, suitable for purified recombinant antigens or complex pathogenic/host whole-cell targets. Provides full-process services ranging from target validation and high-throughput panning to the enrichment of high-affinity molecules.

(4) Controllable timeline: Standard library construction and panning projects generally take 2–4 months (native/immune antibody library construction and standard screening: 2–3 months; complex large-capacity synthetic libraries or special panning: 3–4 months). Standardized procedures guarantee reliable screening results.