Surface Ig variable domain glycosylation affects autoantigen binding and acts as threshold for human autoreactive B cell activation.

Surface Ig variable domain glycosylation affects autoantigen binding and acts as threshold for human autoreactive B cell activation.
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表面Ig可变结构域糖基化影响自身抗原结合,并作为人类自身反应性B细胞活化的阈值。

DOI:
10.1126/sciadv.abm1759
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发表时间:
2022-02-11
期刊:
影响因子:
13.6
通讯作者:
Toes REM
Toes REM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kissel T;Ge C;Hafkenscheid L;Kwekkeboom JC;Slot LM;Cavallari M;He Y;van Schie KA;Vergroesen RD;Kampstra ASB;Reijm S;Stoeken-Rijsbergen G;Koeleman C;Voortman LM;Heitman LH;Xu B;Pruijn GJM;Wuhrer M;Rispens T;Huizinga TWJ;Scherer HU;Reth M;Holmdahl R;Toes REM

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The hallmark autoantibodies in rheumatoid arthritis are characterized by variable domain glycans (VDGs). Their abundant occurrence results from the selective introduction of N-linked glycosylation sites during somatic hypermutation, and their presence is predictive for disease development. However, the functional consequences of VDGs on autoreactive B cells remain elusive. Combining crystallography, glycobiology, and functional B cell assays allowed us to dissect key characteristics of VDGs on human B cell biology. Crystal structures showed that VDGs are positioned in the vicinity of the antigen-binding pocket, and dynamic modeling combined with binding assays elucidated their impact on binding. We found that VDG-expressing B cell receptors stay longer on the B cell surface and that VDGs enhance B cell activation. These results provide a rationale on how the acquisition of VDGs might contribute to the breach of tolerance of autoreactive B cells in a major human autoimmune disease. Variable domain immunoglobulin glycans affect antigen binding and enhance B cell activation.
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