Protein-Protein Interaction Vector Services

Protein-protein interaction (PPI) vectors are key tools for dissecting tumor signaling pathways, identifying drug targets, and investigating drug resistance mechanisms. Alfa Cytology specializes in the construction of PPI research vectors, offering customized, high-quality PPI expression and reporter vectors based on multiple interaction detection systems, including yeast two-hybrid, mammalian two-hybrid, and split luciferase.

Introduction to Protein-Protein Interaction Vector

Protein-protein interactions (PPIs) are fundamental to cellular regulation, participating extensively in signal transduction, gene expression, and metabolic coordination. In cancer research, aberrantly activated or inactivated PPIs are key drivers of tumorigenesis, drug resistance, and tumor microenvironment maintenance. Therefore, reliable PPI research vectors are essential for dissecting tumor signaling pathways, identifying drug targets, and investigating resistance mechanisms. These vectors function by expressing target proteins in specific detection systems and determining interactions based on reporter signal changes. Depending on experimental objectives, vectors can be designed as bait, prey, or reporter vectors, or as general expression vectors, to accommodate platforms such as yeast two-hybrid, mammalian two-hybrid, and split luciferase systems. Different systems place distinct requirements on vectors: yeast two-hybrid systems require compatible reading frames and nuclear localization signals for both bait and prey vectors; mammalian two-hybrid systems emphasize promoter strength and expression levels; and split luciferase systems have specific requirements for fusion fragment linking and spatial conformation. Vector construction quality directly affects detection sensitivity and specificity, imposing stringent requirements on promoter selection, tag position, reading frame consistency, and expression level regulation—a critical step in ensuring reliable tumor PPI network analysis and target screening.

Fig. 1 Schematic of the AAVS1-TRE-TurboID-rtTA vector construction. (Gomes-Junior R, et al.; 2025)

Our Services

Alfa Cytology's protein–protein interaction vector services focus on vector construction and optimization, supporting multiple interaction detection systems including yeast two-hybrid, mammalian two-hybrid, and split luciferase, suitable for interaction discovery, validation, and quantitative detection. We can construct compatible promoter, tag, and reporter gene combinations tailored to your experimental system (yeast, mammalian cells, or in vitro translation systems), and perform rigorous expression validation and functional quality control on all vectors, facilitating your complete workflow from interaction discovery to mechanistic studies.

Yeast Two-Hybrid (Y2H) Vector Construction

Designed for detecting protein interactions in yeast cells, suitable for the discovery and validation of novel interacting proteins in tumor signaling pathways:

• Bait vector construction (pGBKT7, pGBDU series, etc.)
• Prey vector construction (pGADT7, pGAD series, etc.)
• Fusion protein expression validation (Western blot)

• Autoactivation testing and toxicity testing
• Support for library screening or targeted validation

Mammalian Two-Hybrid Vector Construction

Designed for detecting protein interactions in mammalian cells, providing a physiological environment more closely resembling that of tumor cells

• Transcription factor system vector construction (GAL4-AD/BD system or client-specified system)
• Split reporter complementation system vector construction (split luciferase, split GFP/YPet, etc.)

• Fusion protein expression validation
• Quantitative interaction detection

Other PPI Vector Services

Suitable for validation and mechanistic studies of key interactions in tumor driver pathways:

• Co-immunoprecipitation (Co-IP) tag vector construction (Flag, HA, Myc, etc.)
• Tandem affinity purification (TAP) tag vector construction

• Bimolecular fluorescence complementation (BiFC) vector construction

Available Interaction Systems

We support multiple protein–protein interaction detection systems that can be flexibly selected according to your research objectives, helping you rapidly identify the appropriate vector construction strategy.

Specifications

Applications of Protein-Protein Interaction Vector Services

Signaling Pathway Analysis

Detect interactions among key proteins in tumor-associated signaling pathways (e.g., EGFR/PI3K/AKT, Wnt/β-catenin, p53) to elucidate upstream and downstream regulatory relationships and signal transduction mechanisms, providing a basis for targeting critical nodes in these pathways.

Evaluation of Mutation Effects on Interactions

Assess the impact of tumor-associated mutations on protein–protein interactions, revealing the molecular basis of mutation-induced functional abnormalities or acquired drug resistance, and guiding targeted drug development.

PPI Research in the Tumor Microenvironment

Study key interacting protein pairs between tumor cells and immune cells (e.g., T cells, macrophages), explore the interaction mechanisms of immune checkpoints (e.g., PD-1/PD-L1) and other microenvironment-regulatory targets, and support the development of immunotherapeutic strategies.

Target Discovery and Network Pharmacology

Identify novel interaction partners of known tumor driver proteins through Y2H library screening, construct disease-related protein–protein interaction networks, identify key nodes and potential novel intervention targets, and enrich the oncology drug development pipeline.

Workflow of Protein-Protein Interaction Vector Services

Consultation and Strategy Design

We discuss your research objectives, target proteins, and experimental system to recommend the appropriate interaction detection system and design the vector construction strategy.

Vector Construction and Expression Validation

We perform vector design, gene synthesis or subcloning, tag fusion, and vector assembly, followed by expression validation in the target system.

Functional QC and Interaction Detection

Vectors undergo self-activation and toxicity testing, as well as interaction validation (e.g., yeast transformation/mating, dual-luciferase assays).

Delivery and Downstream Support

We deliver plasmid DNA, glycerol stocks, sequencing reports, and expression validation reports, with seamless transfer to downstream screening or mechanism study platforms if needed.

Service Highlights

Leveraging an optimized vector construction platform and a rigorous quality control system, our senior scientists are committed to providing reliable vector tools to meet diverse cancer research needs, from interaction protein discovery and validation of key interactions to screening candidate molecules targeting pathogenic PPIs. Whether you are discovering novel interacting proteins, validating key interactions in tumor signaling pathways, or screening candidate molecules targeting pathogenic PPIs, Alfa Cytology is your trusted partner for reliable PPI vector construction. Contact us today to discuss your project and let our customized vector solutions accelerate your cancer research from interaction discovery to mechanistic insight.

For research use only.