Modular structure of LDL receptor<unk>  members. Domains depicted hatched are differentially spliced and occur in some receptor isoforms only The members of the LDLR<unk>  are characterized by distinct functional domains present in characteristic numbers. These modules are: * LDL receptor type A (LA) repeats of 40 residues each, displaying a triple-disulfide-bond-stabilized negatively charged surface; certain head-to-tail combinations of these repeats are believed to specify ligand interactions; * LDL receptor type B repeats, also known as EGF precursor homology regions, containing EGF-like repeats and YWTD beta propeller domains; * a transmembrane domain, and * the cytoplasmic region with (a) signal(s) for receptor internalization via coated pits, containing the consensus tetrapeptide Asn-Pro-Xaa-Tyr (NPxY). This cytoplasmic tail controls both endocytosis and signaling by interacting with the phosphotyrosine binding (PTB) domain-containing proteins. In addition to these domains which can be found in all receptors of the<unk><unk> , LDL receptor and certain isoforms of ApoER2 and VLDLR contain a short region which can undergo O-linked glycosylation, known as O-linked sugar domain. ApoER2 moreover, can harbour a cleavage site for the protease furin between type A and type B repeats which enables production of a soluble receptor fragment by furin-mediated processing.
Low-density lipoprotein receptor gene family
LDL receptor
VLDL receptor
Heart-type fatty acid binding protein
Tumor-associated glycoprotein 72
Fibroblast growth factor receptor 3
Growth hormone secretagogue receptor
Netrin receptor DCC