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    Biochim Biophys Acta. 1991 Jul 8;1074(2):326-30.

    Isolation of two forms of decay-accelerating factor (DAF) from human urine.

    Nakano Y, Sugita Y, Ishikawa Y, Choi NH, Tobe T, Tomita M.

    Department of Physiological Chemistry, School of Pharmaceutical Sciences, Showa University, Tokyo, Japan.

    Decay-accelerating factor (DAF) was purified from human pooled urine by conventional techniques. The urine DAF was separated into two peaks, pool I and pool II, by gel chromatography. DAF-U1 was isolated from pool I by hydrophobic chromatography, and DAF-U2 from pool II by anti-DAF IgG column. The specific activities of DAF-U1 and DAF-U2 to decay membrane-phase C5 convertase were about 3% and 70% of membrane form DAF, respectively. However, both urine DAFs revealed a similar activity to each other and slightly higher activity than that of membrane form DAF in decay-accelerating fluid-phase C3 convertase of the alternative pathway.

    PMID: 1712233 [PubMed - indexed for MEDLINE]

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