Garcia-Ferrer…Gomis-Rüth {PNAS 112: 8290}

Structural and functional insights into Escherichia coli alpha2-macroglobulin endopeptidase snap-trap inhibition. Proc Natl Acad Sci U S A. 2015 Jul 7;112(27):8290-5. doi: 10.1073/pnas.1506538112.
Crystallographic dimer of E. coli α2-macroglobulin (ECAM, green and orange chains) as induced by tripsin digestion. A peptidase molecule (magenta) may occupy the space within a cage made by the ECAM molecule.