Hyaluronan Binding Protein 2 (HABP2)

Hyaluronan-binding protein 2 is an extracellular serine protease which binds hyaluronic acid. It is involved in cell adhesion. The protein is synthesized as a single chain, but then undergoes an autoproteolytic event to form the functional heterodimer. Further autoproteolysis leads to smaller, inactive peptides. Two transcript variants utilizing alternative polyA sites exist for this gene. Cleaves the alpha-chain at multiple sites and the beta-chain between 'Lys-53' and 'Lys-54' but not the gamma-chain of fibrinogen and therefore does not initiate the formation of the fibrin clot and does not cause the fibrinolysis directly. It does not cleave (activate) prothrombin and plasminogen but converts the inactive single chain urinary plasminogen activator (pro-urokinase) to the active two chain form. Activates coagulation factor VII.