Kringle domain; Kringle domains are believed to play a role in binding mediators, such as peptides, other proteins, membranes, or phospholipids. They are autonomous structural domains, found in a varying number of copies, in blood clotting and fibrinolytic proteins, some serine proteases and plasma proteins. Plasminogen-like kringles possess affinity for free lysine and lysine-containing peptides.
Jiyao W et al.(2023). "The conserved domain database in 2023.",