Abstract
Serum ultrafiltrate was obtained from hemodialysis patient by using an extra corporeal ultrafiltration method equipped with a hollow fiber dialyser, and electrophoresed on the SDS-polyacrylamide gel having a high resolving power in the low molecular weight region less than 40 KD. From immunological property and determination of the sequence of N-terminal 16 amino acids, 25 KD protein was identified to be apo A-I lipoprotein. In contrast to 26 KD apo A-I in HDL, 25 KD apo A-I existed in free state largely as dimer, as revealed by gel filtration. In two-dimensional electrophoresis, 25 KD protein focused as two bands, pI 5.56 and 5.71, being in accord with electrofocusing behavior of apo A-I from HDL5).
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