Abstract：
:The technique of quasi-elastic light scattering was used to measure the translational diffusion coefficient, D, of purified human prothrombin in buffered aqueous solutions and to monitor for the first time the fragmentation of this protein as it is converted to thrombin. The values of D20,w, measured at two different concentrations, are 4.72 X 10(-7) CM2/S at 2MG/CM3 and 4.51 X 10(-7) CM2/S at 5MG/CM3; the corresponding molecular weights (Mw of 92 000 and 120 000), obtained by combining sedimentation velocity measurements with the diffusion data, confirm the presence of molecular aggregates of prothrombin in these solutions. These results, as well as analysis of the intensity-intensity autocorrelation functions from two-component systems with various dimer conformations, indicated the presence of end-to-end dimers in these prothrombin solutions. The values obtained for D indicate a dimer weight fraction of 0.4 to 0.5 in the 2 mg/cm3 solution and 0.6 or greater in the 5 mg/cm3 solution. The fragmentation of prothrombin was monitored in a nonphysiologic activation system, containing taipan snake venom, dihexanoylphosphatidylcholine, and CaCl2. At a temperature of 15 degrees C, conversion to thrombin proceeded very slowly and was still incomplete after 90 h. A method for determing the percentage of converted prothrombin is an activated system containing aggregates from the average value of D and light scattering data is discussed.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Agarwal GP,Gallagher JG,Aune KC,Armeniades CDdoi
10.1021/bi00628a016subject
Has Abstractpub_date
1977-05-03 00:00:00pages
1865-70issue
9eissn
0006-2960issn
1520-4995journal_volume
16pub_type
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