Abstract：
:Recent evidence from molecular cloning, biochemical and immunological experiments has established that the cation-independent mannose-6-phosphate (Man-6-P) receptor and insulin-like growth factor-II (IGF-II) receptor are the same protein. Although the role of the IGF-II/Man-6-P receptor as a transporter of hydrolytic enzymes in the biogenesis of lysosomes is certain, elucidation of the receptor's structure has not yet provided major insights into the function of IGF-II binding. Mutually exclusive binding of IGF-II and naturally occurring phosphomannosyl ligands to distinct but proximal sites on the receptor suggests that the IGF-II/Man-6-P receptor cannot simultaneously fulfill the functional requirements of both IGF-II and lysosomal enzymes. Does the receptor transduce on intracellular signal in order to mediate the biological effects of IGF-II? If so, then the receptor must interact with an effector molecule, perhaps a G protein, in the mechanism of IGF-II action. Further information from ligand binding and especially mutagenesis experiments will be needed to elucidate the potentially multiple functions of the IGF-II/Man-6-P receptor.
journal_name
Cytotechnologyjournal_title
Cytotechnologyauthors
Macdonald RGdoi
10.1007/BF00364994subject
Has Abstractpub_date
1989-12-01 00:00:00pages
287-305issue
4eissn
0920-9069issn
1573-0778journal_volume
2pub_type
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