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TitleStructural insights into immunoglobulin M.
Journal, issue, pagesScience, Vol. 367, Issue 6481, Page 1014-1017, Year 2020
Publish dateFeb 28, 2020
AuthorsYaxin Li / Guopeng Wang / Ningning Li / Yuxin Wang / Qinyu Zhu / Huarui Chu / Wenjun Wu / Ying Tan / Feng Yu / Xiao-Dong Su / Ning Gao / Junyu Xiao /
PubMed AbstractImmunoglobulin M (IgM) plays a pivotal role in both humoral and mucosal immunity. Its assembly and transport depend on the joining chain (J-chain) and the polymeric immunoglobulin receptor (pIgR), ...Immunoglobulin M (IgM) plays a pivotal role in both humoral and mucosal immunity. Its assembly and transport depend on the joining chain (J-chain) and the polymeric immunoglobulin receptor (pIgR), but the underlying molecular mechanisms of these processes are unclear. We report a cryo-electron microscopy structure of the Fc region of human IgM in complex with the J-chain and pIgR ectodomain. The IgM-Fc pentamer is formed asymmetrically, resembling a hexagon with a missing triangle. The tailpieces of IgM-Fc pack into an amyloid-like structure to stabilize the pentamer. The J-chain caps the tailpiece assembly and bridges the interaction between IgM-Fc and the polymeric immunoglobulin receptor, which undergoes a large conformational change to engage the IgM-J complex. These results provide a structural basis for the function of IgM.
External linksScience / PubMed:32029689
MethodsEM (single particle)
Resolution3.4 Å
Structure data

0782

6kxs

EMDB-0782, PDB-6kxs:
Cryo-EM structure of human IgM-Fc in complex with the J chain and the ectodomain of pIgR
Method: EM (single particle) / Resolution: 3.4 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

Source
  • homo sapiens (human)
KeywordsIMMUNE SYSTEM / immunoglobulin / pentamer / transcytosis / secreted

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