Abstract
The cation-dependent mannose 6-phosphate receptor (CD-MPR) is a single-pass type I membrane protein. This protein functions to transport lysosomal enzymes displaying phosphomannosyl residues from the Golgi complex and the cell surface to the lysosome. This glycosylated protein contains three disulfide bridges in its 159-residue extracytoplasmic domain. One of the problems with studying eukaryotic membrane proteins is isolating sufficient quantities. Structural studies typically require several hundred milligrams of highly purified protein. Here we present a method to isolate milligram quantities of CD-MPR/Asn81 suitable for structural studies.
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