Comparative studies of vertebrate lipoprotein lipase: A key enzyme of very low density lipoprotein metabolism

Roger S. Holmes, John L. Vandeberg, Laura A. Cox

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Lipoprotein lipase (LIPL or LPL; E.C.3.1.1.34) serves a dual function as a triglyceride lipase of circulating chylomicrons and very-low-density lipoproteins (VLDL) and facilitates receptor-mediated lipoprotein uptake into heart, muscle and adipose tissue. Comparative LPL amino acid sequences and protein structures and LPL gene locations were examined using data from several vertebrate genome projects. Mammalian LPL genes usually contained 9 coding exons on the positive strand. Vertebrate LPL sequences shared 58-99% identity as compared with 33-49% sequence identities with other vascular triglyceride lipases, hepatic lipase (HL) and endothelial lipase (EL). Two human LPL N-glycosylation sites were conserved among seven predicted sites for the vertebrate LPL sequences examined. Sequence alignments, key amino acid residues and conserved predicted secondary and tertiary structures were also studied. A CpG island was identified within the 5′-untranslated region of the human LPL gene which may contribute to the higher than average (×4.5 times) level of expression reported. Phylogenetic analyses examined the relationships and potential evolutionary origins of vertebrate lipase genes, LPL, LIPG (encoding EL) and LIPC (encoding HL) which suggested that these have been derived from gene duplication events of an ancestral neutral lipase gene, prior to the appearance of fish during vertebrate evolution. Comparative divergence rates for these vertebrate sequences indicated that LPL is evolving more slowly (2-3 times) than for LIPC and LIPG genes and proteins.

Original languageEnglish (US)
Pages (from-to)224-234
Number of pages11
JournalComparative Biochemistry and Physiology - Part D: Genomics and Proteomics
Volume6
Issue number2
DOIs
StatePublished - Jun 2011
Externally publishedYes

Fingerprint

VLDL Lipoproteins
Lipoprotein Lipase
Lipase
Metabolism
Vertebrates
Genes
Enzymes
Glycosylation
Amino Acids
Chylomicrons
CpG Islands
Gene Duplication
Sequence Alignment
5' Untranslated Regions
Liver
Fish
Lipoproteins
Blood Vessels
Muscle
Adipose Tissue

Keywords

  • Amino acid sequence
  • Evolution
  • Gene duplication
  • Lipoprotein lipase
  • Vertebrates

ASJC Scopus subject areas

  • Biochemistry
  • Genetics
  • Molecular Biology
  • Physiology

Cite this

Comparative studies of vertebrate lipoprotein lipase : A key enzyme of very low density lipoprotein metabolism. / Holmes, Roger S.; Vandeberg, John L.; Cox, Laura A.

In: Comparative Biochemistry and Physiology - Part D: Genomics and Proteomics, Vol. 6, No. 2, 06.2011, p. 224-234.

Research output: Contribution to journalArticle

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