The complex of immobilized human plasminogen (iHPlg) and streptokinase (SK) has a lower catalytic activity in hydrolysis of plasmin-specific substrate S-2251 with a kcat/Km of 0.005 μMࢤ1·sࢤ1, compared to 0.031 μMࢤ1·sࢤ1 of immobilized human plasmin (iHPlm) and 0.078 μMࢤ1·sࢤ1 of HPlm. The SK in the complex could be removed by acid buffer solution, and the iHPlg will remain catalytically active. IHPlm·SK complex could activate bovine plasminogen (BPlg), whereas iHPlg·SK complex could not. IHPlg could be activated by interaction with a combination of SK and HPlg or urokinase. The activated iHPlg·SK complex had the ability to activate BPlg as iHPlm·SK. The reasonable explanation is that iHPlg was converted to iHPlm in reaction with the combination of HPlg and SK. However, iHPlg was converted to a virgin enzyme in reaction with SK alone and could not activate BPlg. A new modified mechanism for the interaction of HPlg or HPlm with SK was proposed.
|Number of pages||9|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - 1993 Aug 31|
All Science Journal Classification (ASJC) codes
- Molecular Biology
- Cell Biology