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The LDL receptor gene: a mosaic of exons shared with different proteins.
Abstract
The multifunctional nature of coated pit receptors predicts that these proteins will contain multiple domains. To establish the genetic basis for these domains, we have determined the exon organization of the gene for the low-density lipoprotein (LDL) receptor. This gene is more than 45 kilobases in length and contains 18 exons, most of which correlate with functional domains previously defined at the protein level. Thirteen of the 18 exons encode protein sequences that are homologous to sequences in other proteins: five of these exons encode a sequence similar to one in the C9 component of complement; three exons encode a sequence similar to a repeat sequence in the precursor for epidermal growth factor (EGF) and in three proteins of the blood clotting system (factor IX, factor X, and protein C); and five other exons encode nonrepeated sequences that are shared only with the EGF precursor. The LDL receptor appears to be a mosaic protein built up of exons shared with different proteins, and it therefore belongs to several supergene families.
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LDLR spans the plasma membrane with a single simple transmembrane domain, lacking a GPI anchor.
“LDLR spans the plasma membrane with a single simple transmembrane domain, lacking a GPI anchor13.”
From Pathways and Molecular Mechanisms Governing LDL Receptor Regulation (2025) · cites this paper as [13]
The mature LDLR protein contains 839 amino acids.
“The mature LDLR protein contains 839 amino acids”
From ENO1–BACE2-mediated LDLR cleavage promotes liver cancer progression by remodelling cholesterol metabolism (2025) · cites this paper as Sudhof et al., 1985
LDLR is a membrane-spanning glycoprotein that plays a critical role in removing LDL and VLDL from the blood.
“LDLR is a membrane-spanning glycoprotein that plays a critical role in removing LDL and VLDL from the blood [16], [17].”
From LDLR Expression and Localization Are Altered in Mouse and Human Cell Culture Models of Alzheimer's Disease (2010) · cites this paper as [17]
LDLR is a type I membrane protein with an extracellular/luminal N-terminus, a single transmembrane helix, and a cytosolic C-terminus.
“LDLR is a type I membrane protein, meaning that it possesses an extracellular/luminal N-terminus, followed by a single transmembrane helix and a cytosolic C-terminus, such that this integral membrane protein spans the entirety of the cell membrane11–13.”
From Pathways and Molecular Mechanisms Governing LDL Receptor Regulation (2025) · cites this paper as [13]
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Citations
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Metadata
- Authors
- Südhof, T. C., Goldstein, J. L., Brown, M. S., & Russell, D. W.
- Affiliations
- Department of Molecular Genetics, University of Texas Health Science Center at Dallas, Southwestern Medical School, Dallas 75235.
- Venue
- Science
- Published
- 1985-05-17
- Volume
- 228
- Issue
- 4701
- Pages
- 815-822
- ISSN
- 0036-8075
- 1095-9203
- Cited by
- 611
- References
- 1
- Language
- en
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