Modular OMV Surface Display Service via SpyTag/SpyCatcher for for CAR-T Targeting

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Developing effective CAR-T therapies for solid tumors is often hindered by poor tumor infiltration, complex genetic engineering requirements, and limited flexibility in multi-antigen targeting. Creative Biolabs' Modular OMV Surface Display Service addresses these challenges by leveraging orthogonal SpyTag/SpyCatcher and SnoopTag/SnoopCatcher protein ligation technologies. We provide a versatile platform that displays customized targeting ligands on outer membrane vesicles (OMVs) for the precise redirection of CAR-T cells. This plug-and-play approach enables rapid, multi-specific targeting without re-engineering the CAR-T cells themselves, accelerating your development of next-generation immunotherapies.

Introduction

The SpyTag/SpyCatcher system is a protein ligation technology derived from the CnaB2 domain of Streptococcus pyogenes fibronectin-binding protein, which forms an irreversible covalent isopeptide bond upon specific interaction. By genetically fusing SpyCatcher to OMV scaffold proteins and conjugating SpyTag-labeled targeting ligands, we achieve stable, site-directed display of functional moieties on the OMV surface without chemical crosslinking. This modular platform enables rapid prototyping of multi-specific immune cell engagers, bypassing complex genetic engineering and facilitating flexible, plug-and-play targeting for next-generation cancer immunotherapies.

Fig.1 SpyTag/SpyCatcher-mediated OMV surface engineering. (Creative Biolabs Original) Fig.1 Modular OMV display platform utilizing SpyTag/SpyCatcher technology.

Modular OMV Surface Display via SpyTag/SpyCatcher for CAR-T Targeting at Creative Biolabs

Creative Biolabs delivers a complete portfolio of solutions designed to advance your immunotherapy programs. Our platform separates targeting elements from effector scaffolds, allowing the rapid construction of OMV libraries that engage T-cells, macrophages, and NK cells directly within the tumor microenvironment (TME). We provide fully characterized OMV constructs, validated for particle size, sample purity, and surface ligand density, that are immediately applicable for both in vitro mechanistic studies and in vivo efficacy evaluations.

Core Technology

The SpyTag/SpyCatcher system consists of a short peptide (SpyTag, 13 amino acids) and its complementary protein partner (SpyCatcher, 116 amino acids). Upon mixing, the two components spontaneously undergo isopeptide bond formation, resulting in irreversible covalent conjugation. This reaction proceeds efficiently under a wide range of temperatures, pH levels, and buffer compositions.

Benefits:

High reaction efficiency under mild conditions.
Formation of irreversible and robust covalent linkages.
Modular "plug-and-play" functionality.
Minimal interference with the structure or activity of target proteins.
Broad compatibility across diverse experimental and therapeutic platforms.

Our Service Process

Required Starting Materials: To begin the collaboration, clients generally supply target antigen sequences, selected scFv constructs, or fully characterized parental bacterial strains when a proprietary OMV background is required.

Key Steps:

Workflow of modular OMV surface display via SpyTag/SpyCatcher for CAR-T targeting at Creative Biolabs. (Creative Biolabs Original)

Final Deliverables: We deliver a complete package comprising purified OMV constructs, corresponding donor strain expression plasmids, and a comprehensive analytical report.

Key Advantages

Plug-and-Play Versatility: The SpyTag/SpyCatcher system enables the rapid, covalent, and oriented attachment of various targeting modules to the OMV surface without the need for complex re-engineering, allowing for swift adaptation to different tumor antigens.
Enhanced Combinatorial Targeting: This platform facilitates the co-display of multiple functional moieties on a single OMV, enabling synergistic blockade of immune evasion pathways to effectively remodel the immunosuppressive TME.
Intrinsic Immunostimulatory Capacity: OMVs serve a dual role as both a display scaffold and a potent immunoadjuvant, capable of activating innate immunity, which complements the adaptive cytotoxic function of CAR-T cells for a more robust anti-tumor response.

FAQs

Q1: How does the covalent SpyCatcher/SpyTag linkage compare to non-covalent conjugation methods?

A1: Unlike biotin-avidin or His-tag systems that rely on reversible interactions, the SpyCatcher/SpyTag technology establishes a permanent isopeptide bond. This covalent linkage exhibits exceptional resistance to mechanical shear forces within the circulatory system, preventing premature dissociation of targeting ligands and ensuring stable presentation throughout therapeutic application.

Q2: Is it feasible to display three or more distinct antigens on a single OMV surface?

A2: Absolutely. Through implementation of orthogonal ligation pairs, including SpyCatcher/SpyTag, SnoopCatcher/SnoopTag, and DogCatcher/DogTag, we achieve simultaneous, site-specific conjugation of multiple targeting moieties. These mutually orthogonal systems operate without cross-interference, enabling the construction of homogeneous populations of tri- or tetra-specific OMVs for complex targeting applications.

Why Choose Us

We engineer multifunctional OMVs to target complementary pathways simultaneously, overcoming tumor heterogeneity. Unlike conventional bispecific antibodies, our platform delivers inherent adjuvant activity that actively recruits immune cells into "cold" tumors, transforming the immunosuppressive microenvironment and driving durable anti-tumor responses.

Customer Reviews

"The SpyCatcher-OMV platform from Creative Biolabs has proven highly effective for directing macrophage recruitment into poorly vascularized tumor regions. Its modular design enables us to rapidly exchange targeting ligands, eliminating the need for time-intensive re-engineering of our master cell banks." Dr. A***n L.

"Creative Biolabs' orthogonal SnoopCatcher/SpyCatcher system was critical for the success of our trispecific engager program. We achieved exceptional ligand density and surface stability on OMVs, significantly outperforming conventional biotin-avidin conjugation methods in both reproducibility and covalent durability." Prof. S***e M.

"Adopting the 'freezer-to-patient' OMV strategy allowed us to circumvent the substantial expense and complexity of viral vector manufacturing for our CAR-T initiative. The covalent SpyTag/SpyCatcher linkage demonstrates remarkable resilience in physiological environments, ensuring stable construct performance throughout our studies." Dr. J***h K.

How to contact us?

Creative Biolabs offers an end-to-end solution for modular immunotherapy, spanning from genetic engineering of donor strains to the final validation of covalent OMV constructs. Our platform empowers researchers to overcome the limitations of fixed-specificity CAR-T through "plug-and-play" modularity, high stability, and multi-specific targeting.

For more information on how our Modular OMV Surface Display platform can accelerate your project, please contact our technical team.

All products and services are For Research Use Only and CANNOT be used in the treatment or diagnosis of disease.