Abstract
A cDNA clone for the mouse 46-kDa mannose 6-phosphate receptor (MPR 46) was isolated from an embryonic mouse cDNA library. Its single open reading frame codes for a protein of 278 residues. It shows an over-all amino-acid identity of 93% with the human receptor. Nine non-conservative amino-acid exchanges are found in the luminal domain, one non-conservative exchange of hydrophobic amino acids is in the transmembrane domain, while the cytoplasmic receptor tails are identical. All five potential N-glycosylation sites are conserved as well as amino acids that are important for ligand binding (Arg 137 and His 131) and disulfide pairing (Cys 32 and 78, Cys 132 and Cys 167, Cys 145 and Cys 179). The absolute identity in the cytoplasmic MPR 46 tail suggests the importance of this amino-acid sequence for the intracellular routing of the MPR 46.
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