This domain is found in a group of proteins predominantly found in proteobacteria, including Alpha-2-macroglobulin (A2MG) from Salmonella typhimurium, a protein that protects the bacterial cell from host peptidases. A2MG is composed of 13 domains, 12 of them folding as beta sandwiches. This entry represents the CUB (complement C1r/C1s, Uegf, Bmp1) domain, which is connected to the TED domain (Pfam:PF07678).

1: Structure of protease-cleaved Escherichia coli alpha-2-macroglobulin reveals a putative mechanism of conformational activation for protease entrapment. Fyfe CD, Grinter R, Josts I, Mosbahi K, Roszak AW, Cogdell RJ, Wall DM, Burchmore RJ, Byron O, Walker D; Acta Crystallogr D Biol Crystallogr. 2015;71:1478-1486. PMID:26143919

2: Structure of a bacterial alpha2-macroglobulin reveals mimicry of eukaryotic innate immunity. Wong SG, Dessen A; Nat Commun. 2014;5:4917. PMID:25221932

3: Structural and functional insights into Escherichia coli alpha2-macroglobulin endopeptidase snap-trap inhibition. Garcia-Ferrer I, Arede P, Gomez-Blanco J, Luque D, Duquerroy S, Caston JR, Goulas T, Gomis-Ruth FX; Proc Natl Acad Sci U S A. 2015;112:8290-8295. PMID:26100869