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pubmed-article:8288243pubmed:abstractTextA previously undescribed single missense mutation (C-->G) was detected within exon 5 of the LPL gene in two members of an Italian family affected with type I hyperlipoproteinemia. This mutation causes a highly conservative amino acid replacement (Asp-->Glu) at position 180 of the mature LPL protein resulting in a virtual absence of LPL enzyme activity and LPL enzyme mass in postheparin plasma. Adipose tissue mRNA concentrations and mRNA sizes were not affected. Both patients were homozygous for the mutation, whereas the parents were heterozygous. Comparison of the expression of the mutated cDNA and the wildtype cDNA in cos-7 cells revealed proper transcription and translation of the mutated clone into an immunologically detectable protein. The mutated LPL protein was secreted from the cells in a manner similar to that of wild-type LPL and bound to heparin-Sepharose with identical properties. However, the mutated enzyme, in contrast to wildtype LPL, exhibited no detectable lipolytic activity against a triglyceride substrate. Our results demonstrate that even a highly conservative amino acid replacement outside the proposed active site of LPL is incompatible with proper enzyme function.lld:pubmed
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pubmed-article:8288243pubmed:articleTitleA novel missense mutation in the gene for lipoprotein lipase resulting in a highly conservative amino acid substitution (Asp180-->Glu) causes familial chylomicronemia (type I hyperlipoproteinemia).lld:pubmed
pubmed-article:8288243pubmed:affiliationInstitute of Medical Biochemistry, Karl-Franzens University Graz, Austria.lld:pubmed
pubmed-article:8288243pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8288243pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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