Recent studies of the interaction of rabbit dimeric IgA with its polymeric immunoglobulin receptor
Annales de l'Institut Pasteur / Immunologie, ISSN: 0769-2625, Vol: 139, Issue: 1, Page: 21-40
1988
- 6Citations
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Article Description
Rabbit secretory components (SC) constitute a highly heteregeneous population of glycoprotein molecules that are present in secretions as free or bound forms to polymeric immunoglobulins (Ig). Two SC families are known, one of high molecular weight (⋍ 80 Kd) composed of five (perhaps six) domains related to Ig variable domains, and one of low molecular weight (⋍ 55 Kd) An account of our most recent experimental data is reviewed in this article. We have shown: 1.1) that both the high and low Mr SC families possess the same relative avidity for binding to dimeric IgA of the g-sublanguage;2.2) that the first NH2-terminal domain of SC derived from the high and low Mr polypeptides is necessary and sufficient for efficient non-covalent binding to dimeric IgA of the g-sublanguage;3.3) that the low Mr SC polypeptide derives from the high Mr SC by the internal deletion of the entire second and third domains, suggesting that these domains are not involved in the binding reaction with polymeric Ig;4.4) that the heterogeneity of rabbit secretory components is, in large part, due to the expression of several polymorphic forms (allotypes) susceptible to be recognized by specific alloantisera; the biochemical characterization of the three known SC allotypes (t61, t62 and t63) reveals that t62 and t63 are structurally very similar to each other and markedly divergent from the t61 homologue;5.5) that by using non-cross-reactive alloantisera, the major immunodominant allotopes are confined within the COOH-terminal domains 3, 4 and 5 of SC;6.6) that the location of the residues involved in the attachment of the carbohydrate unit within domain 1 varies according to the allotype: t61 is N-linked glycosylated at position 70, whereas about 75 % of t62 molecules are devoid of sugars; the remaining 25 % of t62 molecules are glycosylated at residue position 90; these oligosaccharide chain units are linked to asparagine residues in the acceptor site consensus sequence, Asn-X-Thr/Ser;7.7) that the presence of the carbohydrate unit in domain 1 is not required for efficient binding of this domain to polymeric Ig: indeed, after enzymatic deglycosylation, domain 1 exhibits a relative binding avidity which is indistinguishable from that of the native glycosylated domain 1.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/0769262588901298; http://dx.doi.org/10.1016/0769-2625(88)90129-8; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0023858017&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/3358866; https://linkinghub.elsevier.com/retrieve/pii/0769262588901298; http://dx.doi.org/10.1016/0769-2625%2888%2990129-8; https://dx.doi.org/10.1016/0769-2625%2888%2990129-8
Elsevier BV
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