background:
Cubilin is an endocytic receptor that lacks a classical transmembrane region. It is a multidomain receptor that contains an amino terminal 110 residue segment followed by 8 epidermal growth factor (EGF)-like repeats and a contiguous stretch of 27 CUB domains. Cubilin acts as a receptor for intrinsic factor-vitamin B12 complexes. Cubilin is located within the epithelium of intestine and kidney. Cubilin co-localizes with and binds to Megalin, a 600kDa member of the LDL receptor family that is required for the internalization of cubilin-bound ligands, such as vitamin B12, apolipoprotein A1 and Albumin. Megalin specifically binds to cubilin in the amino terminal region that contains the EGF-like repeats and CUB domains 1 and 2. Mutations in Cubilin may play a role in autosomal recessive megaloblastic anemia also known as Imerslund-Grasbeck’s disease, which causes intestinal malabsorption of vitamin B12.
Subunit:
"Interacts with LRP2 in a dual-receptor complex in a calcium-dependent manner. Component of the cubam complex composed of CUBN and AMN. The cubam complex can oligomerize and form cubam trimers. Found in a complex with PID1/PCLI1, LRP1 and CUBNI. Interacts with LRP1 and PID1/PCLI1.
Subcellular Location:
Endosome membrane; Peripheral membrane protein. Lysosome membrane; Peripheral membrane protein.
Tissue Specificity:
Expressed in kidney proximal tubule cells, placenta, visceral yolk-sac cells and in absorptive intestinal cells. Expressed in the epithelium of intestine and kidney.
Similarity:
Contains 27 CUB domains.
Contains 7 EGF-like domains.
Important Note:
This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications.
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