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J. Biol. Chem., Vol. 266, Issue 7, 4074-4080, Mar, 1991

Demonstration of apolipoprotein CII in guinea pigs. Functional characteristics, cDNA sequence, and tissue expression

Y Andersson, L Thelander and G Bengtsson-Olivecrona
Department of Medical Biochemistry and Biophysics, University of Umea, Sweden.

In contrast to plasma from other mammals, guinea pig plasma does not stimulate the activity of lipoprotein lipases in vitro. This had led previously to the conclusion that guinea pigs lack an analogue to apolipoprotein CII (apoCII). By adsorption of lipid-binding proteins to lipid droplets, thereby separating them from other plasma components, we could demonstrate apoCII-like activity in guinea pig plasma. On electrophoresis, the CII-like activity co-migrated with one isoform of guinea pig apolipoprotein CIII, identified by amino-terminal amino acid sequence determination (40 residues). By isoelectric focusing in a narrow pH gradient, the activating protein was separated sufficiently from the dominating apoCIII isoform to allow sequence determination of 8 residues from the amino terminus. Six of these were identical to corresponding residues in apoCII from dog and monkey. With the aid of a human apoCII cDNA probe we identified one cross-hybridizing mRNA species (approximately 600 nucleotides) on Northern blots of guinea pig liver. Three positive clones were isolated from a guinea pig liver cDNA library using the same cDNA probe. The nucleotide sequence showed extensive similarities to the previously known human, monkey, and canine sequences, but the signal peptide was 3 amino acid residues longer in the guinea pig protein, and there was a deletion of 4 residues in the putative lipid binding domain. Northern blot analyses indicated that guinea pig apoCII is mainly expressed in the liver with little or no contribution from the intestine.
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