Services

IgA-FcRn Binding Motif Engineering Service

Background Service Advantages Applications FAQs

Direct Engagement of FcRn for Enhanced IgA Persistence

Native IgA antibodies exhibit minimal affinity for the neonatal Fc receptor (FcRn), resulting in rapid clearance from systemic circulation. To address this, Creative Biolabs offers a specialized IgA-FcRn Binding Motif Engineering Service, which focuses on rationally introducing FcRn recognition sequences or site-directed mutations into IgA molecules to facilitate direct FcRn-mediated recycling.

This targeted engineering approach extends the half-life of IgA without compromising antigen binding, mucosal function, or FcαRI engagement—providing a versatile platform for generating long-acting IgA formats suited to diverse therapeutic and research applications.

Service Highlights

Rational FcRn Motif Integration

We apply structure-guided design to introduce mutations such as YTE (M252Y/S254T/T256E) or LS (M428L/N434S) into the IgA Fc region or create chimeric Fc replacements.
Each construct is modeled for structural compatibility, minimizing disruption to IgA-specific domains and preserving immune effector interactions.

Tailored Expression and Molecular Assembly

Engineered IgA constructs are expressed in CHO or HEK293 cells and assembled into either monomeric or polymeric forms depending on target use.
Constructs undergo quality control checks for glycosylation profile, J-chain incorporation, and correct disulfide bond formation.

FcRn Binding and Retention Evaluation

Binding to human FcRn is tested using SPR, BLI, or ELISA at pH 6.0 and pH 7.4 to confirm pH-dependent engagement and predict serum persistence.
Constructs are benchmarked against wild-type IgA and IgG controls to quantify enhancement in FcRn-mediated retention.

Comprehensive Functional Assessment

In addition to FcRn validation, we ensure antigen-binding affinity, FcαRI activation, and polymeric IgA stability remain unaffected.
Optional testing includes receptor competition assays, stability under oxidative conditions, and glycoform impact evaluation.

Advantages of Our Service

Precise Engineering: Targeted mutations enable direct control over FcRn engagement without disrupting the overall structure of IgA.
Dual Function Retention: Engineered antibodies retain IgA's mucosal activity while acquiring IgG-like recycling capacity.
Adaptable to Multiple Formats: Compatible with full-length IgA, bispecifics, or fusion constructs.
Rapid Prototyping: Short turnaround for design, mutation incorporation, and expression.

Applications

Fig.1 Applications of this service. (Creative Biolabs Original)

FAQs

Q1: Are YTE or LS mutations compatible with IgA Fc structures?

A1: They can be adapted through site-directed substitution, especially when modifying hinge or tailpiece regions. Our design accounts for IgA-specific constraints.

Q2: Will FcRn binding affect polymeric IgA behavior?

A2: We evaluate both monomeric and dimeric forms to ensure that polymerization and pIgR transport are not negatively impacted.

Q3: Can you assess binding across species-specific FcRn?

A3: Yes, we can conduct FcRn binding assays using human, murine, or non-human primate FcRn, based on your target model system.

Contact Us

At Creative Biolabs, we understand that each IgA engineering project comes with unique design considerations and development goals. Whether you are exploring FcRn-binding motif variants, optimizing IgA for extended systemic retention, or comparing engineered formats, our team is ready to provide comprehensive technical support and customized solutions.

To learn more about our IgA-FcRn Binding Motif Engineering Service or to discuss your specific project requirements, please don't hesitate to reach out.

For research use only. Not intended for any clinical use.

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