Purification and physicochemical properties of C1q from guinea-pig serum.

Abstract:

:An efficient method is described for the isolation of highly purified, IgG-free and stable guinea-pig serum C1q. The procedure includes the chromatography of EDTA-treated serum (25 mM EDTA) on CM- and DEAE-cellulose followed by gel filtration on ACA 34-Ultrogel whereby ammonium sulfate precipitation was used for concentration. The final product stored in a glycerol containing buffer was purified 700-fold with a yield of approximately 50%. It was judged to be homogeneous by several criteria including SDS-PAGE, analytical ultracentrifugation, gel filtration and immunoprecipitation. The protein has a sedimentation rate of 11.3 S and consists of three distinct polypeptide chains A, B and C with mol. wts of 30,200, 28,200 and 24,000. Amino acid analysis revealed a content of 4.42% hydroxyproline, 1.81% hydroxylysine and 18.7% glycine. In contrast to human serum C1q a very low content of cysteine residues was detected. SDS-PAGE analysis performed in the absence of 2-mercaptoethanol but in the presence of 5-10% SDS revealed clearly that gps-C1q is dissociated in a time-dependent manner into the individual chains.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Hitschold T,Golan MD,Rabs U,Loos M

doi

10.1016/0161-5890(83)90133-5

subject

Has Abstract

pub_date

1983-02-01 00:00:00

pages

213-21

issue

2

eissn

0161-5890

issn

1872-9142

journal_volume

20

pub_type

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