NCIt definition : Cation-independent mannose-6-phosphate receptor (2491 aa, 274 kDa) is encoded by
the human IGF2R gene. This protein is involved in receptor-mediated endocytosis.;
NCIt note : IGF2R is a 250kDa transmembrane protein. It was originally identified as a receptor
for IGFII and M6P-containing proteins (e.g. lysosomal hydrolases). Lysosomal enzymes
are sorted to lysosomes via IGF2R either from the Golgi, where the enzymes acquire
M6P, or from the extracellular space. The majority of IGF2R molecules are located
intracellularly, only 5-10% is present on the cell membrane. IGF2R is also a receptor
for TGFbeta latency associated peptide (LAP), proliferin and may bind several molecules
independently of M6P, including plasminogen, CD87 or retinoic acid. It is involved
in activation of latent TGFbeta. It is a putative hepatocellular tumor suppressor.
(from LocusLink);