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- W2077187562 abstract "A relatively rapid procedure is described for the isolation of the fourth component of complement (C4) from ovine plasma. The method, which recovers approximately 30% C4, is based upon DEAE Sephacel anion exchange chromatography of PEG precipitated plasminogen depleted plasma followed by cation exchange chromatography on CM Sepharose and finally gel filtration. SDS-PAGE of purified ovine C4 under reducing conditions revealed a complex pattern of bands which was interpreted on the basis of a three polypeptide chain structure for each of two distinct species, or isotypes, of C4 molecule herein termed C4A and C4B. Each isotype differs in the mol. wt of the alpha chain--108 and 95 K respectively. Nucleophilic substitution of immunoprecipitated ovine C4 with radiolabelled methylamine revealed that both C4 species contained a reactive thiol ester site and that each could be cleaved into an activated form (presumably C4b) characterised by a truncated alpha' chain some 8 K lower in mol. wt. A comparison of the isotype composition of purified C4 with that of immunoprecipitated C4 from the same animal indicated that the purification procedure favoured isolation of the C4B isotype. The mol. wts of both the alpha and beta chains were lowered following digestion of ovine C4 with neuraminidase." @default.
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- W2077187562 date "1988-06-01" @default.
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- W2077187562 title "Purification and characterisation of ovine C4: Evidence for two molecular forms in ovine plasma" @default.
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- W2077187562 doi "https://doi.org/10.1016/0161-5890(88)90080-6" @default.
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