This domain is found in Actinobacillus pleuropneumoniae HMW1C (ApHMW1C). HMW1 adhesin is an N-linked glycoprotein that mediates adherence to respiratory epithelium through N-glycosylation of protein acceptor sites and O-glycosylation of sugar acceptor sites. This domain forms an all alpha domain (AAD) when combined with the N-terminal domain. The AAD interacts extensively with the C-terminal GT-B fold in order to create a unique groove with the potential to accommodate the acceptor protein.
Jiyao W et al.(2023). "The conserved domain database in 2023.",