A naturally occurring mutation at the second base of codon asparagine 43 in the proposed N-linked glycosylation site of human lipoprotein lipase: in vivo evidence that asparagine 43 is essential for catalysis and secretion.
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Kobayashi J, Inadera H, Fujita Y, Talley G, Morisaki N, Yoshida S, Saito Y, Fojo SS, Brewer HB Jr
A naturally occurring mutation at the second base of codon asparagine 43 in the proposed N-linked glycosylation site of human lipoprotein lipase: in vivo evidence that asparagine 43 is essential for catalysis and secretion.
Biochem Biophys Res Commun. 1994 Nov 30;205(1):506-15.
- PubMed ID
- 7999071 [ View in PubMed]
- Abstract
The patient was a 20-year-old male. His fasting plasma triglyceride and cholesterol levels were 1258 mg/dl and 138 mg/dl, respectively. The lipoprotein lipase (LPL) activity and mass from postheparin plasma of the patient were 0.00 mumol/ml/h (normal range: 5.51 +/- 1.12) and 23 ng/ml (normal range: 220 +/- 42), respectively. DNA sequence analysis of the LPL gene from the patient revealed a homozygous nucleotide change: a A-->G transition at nucleotide position 383, resulting in an amino acid substitution of Ser for Asn43, which is believed to be an N-linked glycosylation site of the LPL mature protein. Expression studies of this mutant LPL cDNA produced an inactive LPL protein which was not secreted into the media.