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J chain
Protein-coding gene in the species Homo sapiens / From Wikipedia, the free encyclopedia
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The Joining (J) chain is a protein component that links monomers of antibodies IgM and IgA to form polymeric antibodies capable of secretion.[5] The J chain is well conserved in the animal kingdom, but its specific functions are yet to be fully understood. It is a 137 residue polypeptide,[6] encoded by the IGJ gene.[7][8][9]
Quick Facts JCHAIN, Identifiers ...
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/IgM.png/640px-IgM.png)
1: Base unit.
2: Heavy chains.
3: Light chains.
4: J chain.
5: Intermolecular disulfide bonds.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/85/Dimeric_IgA_schematic_01.svg/640px-Dimeric_IgA_schematic_01.svg.png)