Molecule of the Month: Secretory Antibodies
Secretory immunoglobulins are our most abundant antibodies, providing a first line of defense against pathogens.
Guardians of Biology
Getting a Firm Grip
Plotting Against the Guardians
Exploring the Structure
Secretory IgM Core
Secretory IgM antibodies have five copies of the typical Y-shaped antibodies, allowing them to bind to many adjacent sites on the surface of a pathogen. As with sIgA, the complex is held together with a J-chain (magenta) and a beta-sheet of tails from the antibody chains (bright yellow). It also includes a secretory component, shown in purple. PDB entry 6kxs, shown here, includes the central core of the molecule, but is missing the Fab domains. To explore this structure in more detail, click on the image for an interactive Jsmol.
August 2022, Lauryn Brooks, Carolina Colón-Colón, Aayushi Patel, Asya Polat, David Goodsellhttp://doi.org/10.2210/rcsb_pdb/mom_2022_8