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Updated: Jul 9, 2025

Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
Published on: March 6, 2013
Structural and biochemical requirements for secretory component interactions with dimeric Immunoglobulin A
Sonya Kumar Bharathkar1,2,3, Beth M Stadtmueller1,2,3
1Department of Biochemistry, University of Illinois Urbana-Champaign, Urbana, Illinois 61801 USA.
Secretory Immunoglobulin A (SIgA) is crucial for mucosal immunity. This study identifies key residues in secretory component (SC) that bind dimeric IgA (dIgA), revealing mechanisms of SIgA transport and function.
Area of Science:
- Immunology
- Structural Biology
- Molecular Biology
Background:
- Secretory Immunoglobulin A (SIgA) is the primary antibody at mucosal surfaces, essential for host defense and microbial balance.
- SIgA is formed by assembling dimeric IgA (dIgA) with a joining chain (JC) and then binding to the polymeric Ig receptor (pIgR) for epithelial transport.
- The pIgR ectodomain, secretory component (SC), undergoes conformational changes upon dIgA binding to form the mature SIgA complex.
Conclusions:
- This research provides detailed insights into the molecular interactions between SC and dIgA, crucial for SIgA function.
- The findings identify specific residues involved in SC-dIgA binding, informing models of IgA transport across epithelia.
- Understanding these interactions advances knowledge of mucosal immunity and potential therapeutic strategies.
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