In mammals, Mannose 6-phosphate receptor proteins (MPR 300 and MPR 46) mediate transport of lysosomal enzymes to lysosomes. Both receptors have been found in non-mammalian vertebrates including fish. To investigate the presence of MPRs in invertebrates, MPR 300 protein was isolated from the mollusc unio by affinity chromatography. It was shown to exhibit biochemical and immunological properties similar to mammalian MPR 300.
Identification of the Putative Mannose 6-phosphate Receptor Protein (MPR 300) in the Invertebrate unio
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Yerramalla Udaya Lakshmi, Yalamarthy Radha, Annette Hille-Rehfeld, Kurt von Figura, Nadimpalli Siva Kumar; Identification of the Putative Mannose 6-phosphate Receptor Protein (MPR 300) in the Invertebrate unio. Biosci Rep 1 October 1999; 19 (5): 403–409. doi: https://doi.org/10.1023/A:1020212222363
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