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. 1988 Mar 1;250(2):539–545. doi: 10.1042/bj2500539

Multiple forms of sheep serum A-esterase activity associated with the high-density lipoprotein.

M I Mackness 1, C H Walker 1
PMCID: PMC1148889  PMID: 2451511

Abstract

Five lipoproteins of sheep serum expressing A-esterase activity, but with differing activities towards four organophosphate substrates, were separated by a combination of gel filtration and ion-exchange chromatography. Each had an Mr of approx. 360,000 and contained a major peptide of Mr 28,000-30,000 that appeared to be present as several isoforms on urea/agarose isoelectric focusing. In every case this peptide split into a number of bands on urea/agarose isoelectric focusing. The bands appear to represent isoforms of the peptide, and four lipoproteins yielded characteristic patterns of bands. This peptide resembles the apolipoprotein A-I of human serum, and available evidence suggests that this is the protein that expresses A-esterase activity. Evidence is presented for the existence of different species of high-density lipoprotein HDL2 particles containing different complements of peptide isoforms and expressing contrasting substrate specificities towards organophosphates.

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Selected References

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