The human 'protective protein' (HPP) forms a multi-enzyme complex with beta-galactosidase and neuraminidase in the lysosomes, protecting these two glycosidases from degradation. In humans, deficiency of HPP leads to the lysosomal storage disease galactosialidosis ...
The human 'protective protein' (HPP) forms a multi-enzyme complex with beta-galactosidase and neuraminidase in the lysosomes, protecting these two glycosidases from degradation. In humans, deficiency of HPP leads to the lysosomal storage disease galactosialidosis. Proteolytic cleavage of the precursor form of HPP involves removal of a 2 kDa excision peptide and results in a carboxypeptidase activity. The physiological relevance of this activity is, as yet, unknown.
Related Citations:
Structure Determination of the Human Protective Protein: Twofold Averaging Reveals the Three-Dimensional Structure of a Domain which Was Entirely Absent in the Initial Model Rudenko, G., Bonten, E., D'Azzo, A., Hol, W.G.J. (1996) Acta Crystallogr D Biol Crystallogr 52: 923
Expression of Cdna Encoding the Human 'Protective Protein' Associated with Lysosomal Beta-Galactosidase and Neuraminidase: Homology to Yeast Proteases Galjart, N.J., Gillemans, N., Harris, A., Van Der Horst, G.T., Verheijen, F.W., Galjaard, H., D'Azzo, A. (1988) Cell 54: 755
Organizational Affiliation:
Department of Biological Structure, School of Medicine, University of Washington, Seattle 98195-7742, USA.
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