Three-dimensional structure of the human 'protective protein': structure of the precursor form suggests a complex activation mechanism.
Rudenko, G., Bonten, E., d'Azzo, A., Hol, W.G.(1995) Structure 3: 1249-1259
- PubMed: 8591035 
- DOI: https://doi.org/10.1016/s0969-2126(01)00260-x
- Primary Citation of Related Structures:  
1IVY - PubMed Abstract: 
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.
Organizational Affiliation: 
Department of Biological Structure, School of Medicine, University of Washington, Seattle 98195-7742, USA.