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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The bovine mannose 6-phosphate/insulin-like growth factor II receptor. Localization of mannose 6-phosphate binding sites to domains 1-3 and 7-11 of the extracytoplasmic region.

The extracytoplasmic region of the 270-kDa mannose 6-phosphate/IGF-II receptor is composed of 15 repeating domains and is capable of binding 2 mol of mannose 6-phosphate (Man-6-P). To localize the Man-6-P binding domains, bovine receptor was subjected to partial proteolysis with subtilisin followed by affinity chromatography on pentamannosyl phosphate-agarose. Eleven proteolytic fragments ranging in apparent molecular mass from 53 to 206 kDa were isolated. Sequence analysis of six of the fragments localized their amino termini to either the beginning of domain 1 at the amino terminus of the molecule or the beginning of domain 7, according to the alignment of Lobel et al. (Lobel, P., Dahms, N. M., and Kornfeld, S. (1988) J. Biol. Chem. 263, 2563-2570). The smallest fragment, with an apparent molecular mass of 53 kDa, is predicted to encompass domains 1-3. Another fragment, with an apparent molecular mass of 82 kDa, is predicted to encompass domains 7-10 or 7-11. The Man-6-P binding site contained within domains 1-3 was further defined by expressing truncated forms of the receptor in Xenopus laevis oocytes and assaying their ability to bind phosphomannosyl residues. A soluble polypeptide containing domains 1-3 exhibited binding activity, whereas a polypeptide containing domains 1 and 2 did not. This indicates that domain 3 is a necessary component of one of the Man-6-P binding sites of the receptor.[1]


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