F. Uras et al., Determination of the N-terminal amino acid sequence of the purified prothrombin from a patient with liver cirrhosis, THROMB RES, 99(3), 2000, pp. 277-283
The reasons for the decreased functional activity of prothrombin in liver d
iseases are still speculative. When a highly purified preparation of prothr
ombin from a patient with liver cirrhosis is available, the cause of prothr
ombin abnormalities may be researched on, a molecular basis. In this study,
prothrombin (6.7 mg) was purified from the ascites fluid (1130 mL) of a pa
tient with liver cirrhosis by barium citrate adsorption, ammonium sulfate e
lution, DEAE Sephacel and Heparin Sepharose CL-6B column chromatography ste
ps. The molecular weight of this prothrombin was the same as that of normal
prothrombin purified from a normal plasma pool. The specific activities we
re found to be 3.36 U/mg in the one stage clotting assay and 28.9 U/mg in t
he staphylocoagulase/chromogenic substrate assay, while the normal prothrom
bin specific activities were 3.92 U/mg and 30.1 U/mg respectively. When N-t
erminal amino acid sequence analysis was carried out, it was seen that the
first 20 residues were identical to the normal human prothrombin excepting
the Gla at position #14. (C) 2000 Elsevier Science Ltd. All rights reserved
.