Abstract:
:The "protective protein" is a glycoprotein that associates with lysosomal beta-galactosidase and neuraminidase and is deficient in the autosomal recessive disorder galactosialidosis. We have isolated the cDNA encoding human "protective protein". The clone recognizes a 2 kb mRNA in normal cells that is not evident in fibroblasts of an early infantile galactosialidosis patient. The cDNA directs the synthesis of a 452 amino acid precursor molecule that is processed in vivo to yield mature "protective protein," a heterodimer of 32 kd and 20 kd polypeptides held together by disulfide bridges. This mature form is also biologically functional since it restores beta-galactosidase and neuraminidase activities in galactosialidosis cells. The predicted amino acid sequence of the "protective protein" bears homology to yeast carboxypeptidase Y and the KEX1 gene product. This suggests a protease activity for the "protective protein."
journal_name
Celljournal_title
Cellauthors
Galjart NJ,Gillemans N,Harris A,van der Horst GT,Verheijen FW,Galjaard H,d'Azzo Adoi
10.1016/s0092-8674(88)90999-3subject
Has Abstractpub_date
1988-09-09 00:00:00pages
755-64issue
6eissn
0092-8674issn
1097-4172pii
S0092-8674(88)90999-3journal_volume
54pub_type
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