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Protein: PPGB_HUMAN

Lysosomal protective protein

FUNCTION: Protective protein appears to be essential for both the activity of beta-galactosidase and neuraminidase, it associates with these enzymes and exerts a protective function necessary for their stability and activity. This protein is also a carboxypeptidase and can deamidate tachykinins. CATALYTIC ACTIVITY: Release of a C-terminal amino acid with broad specificity. more...

SUBUNIT: Heterodimer of a 32 kDa chain and a 20 kDa chain; disulfide-linked.

SUBCELLULAR LOCATION: Lysosome.

DISEASE: Defects in CTSA are the cause of galactosialidosis (GSL) [MIM:256540]. A lysosomal storage disease associated with a combined deficiency of beta-galactosidase and neuraminidase, secondary to a defect in cathepsin A. All patients have clinical manifestations typical of a lysosomal disorder, such as coarse facies, cherry red spots, vertebral changes, foam cells in the bone marrow, and vacuolated lymphocytes. Three phenotypic subtypes are recognized. The early infantile form is associated with fetal hydrops, edema, ascites, visceromegaly, skeletal dysplasia, and early death. The late infantile type is characterized by hepatosplenomegaly, growth retardation, cardiac involvement, and a normal or mildly affected mental state. The juvenile/adult form is characterized by myoclonus, ataxia, angiokeratoma, mental retardation, neurologic deterioration, absence of visceromegaly, and long survival.

SIMILARITY: Belongs to the peptidase S10 family.

SEQUENCE CAUTION: Sequence=CAI20248.1; Type=Erroneous initiation; WEB RESOURCE: Name=GeneReviews; URL="http://www.ncbi.nlm.nih.gov/sites/GeneTests/lab/gene/CTSA";

GENE SYNONYMS: PPGB.

COPYRIGHT: Protein annotation is derived from the UniProt Consortium (http://www.uniprot.org/). Distributed under the Creative Commons Attribution-NoDerivs License.

 

Organism:

  • Homo sapiens

Gene Symbol:

  • CTSA

Synonyms:

  • Lysosomal protective protein 32 kDa chain
  • Carboxypeptidase L
  • Lysosomal protective protein 20 kDa chain
  • Protective protein for beta-galactosidase
  • PPCA
  • Protective protein cathepsin A
  • Cathepsin A
  • 3.4.16.5
  • Carboxypeptidase C

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