Cathepsin D

Cathepsin D

PDB rendering based on 1lya.
Identifiers
Symbols CTSD; CLN10; CPSD; MGC2311
External IDs OMIM116840 MGI88562 HomoloGene55616 GeneCards: CTSD Gene
EC number 3.4.23.5
RNA expression pattern
More reference expression data
Orthologs
Species Human Mouse
Entrez 1509 13033
Ensembl ENSG00000117984 ENSMUSG00000007891
UniProt P07339 Q05BF3
RefSeq (mRNA) NM_001909 NM_009983.2
RefSeq (protein) NP_001900 NP_034113.1
Location (UCSC) Chr 11:
1.77 – 1.79 Mb
Chr 7:
149.56 – 149.57 Mb
PubMed search [1] [2]

Cathepsin D is a protein that in humans is encoded by the CTSD gene.[1][2]

This gene encodes a lysosomal aspartyl protease composed of a dimer of disulfide-linked heavy and light chains, both produced from a single protein precursor. This proteinase, which is a member of the peptidase A1 family, has a specificity similar to but narrower than that of pepsin A. Transcription of this gene is initiated from several sites, including one which is a start site for an estrogen-regulated transcript. Mutations in this gene are involved in the pathogenesis of several diseases, including breast cancer and possibly Alzheimer disease.[2]

It has been used as a breast cancer tumor marker.[3]

Cathepsin-D is an aspartic protease that depends critically on protonation of its active site Asp residue and gets activated at pH 5 in endosome of hepatocytes where it degrades insulin. Along with Asp-protonation, lower pH also leads to conformational switch in cathepsin-D : the N terminal segment of the protease moves out of the active site as pH drops [4] [5] [6] .

References

  1. ^ Faust PL, Kornfeld S, Chirgwin JM (Sep 1985). "Cloning and sequence analysis of cDNA for human cathepsin D". Proc Natl Acad Sci U S A 82 (15): 4910–4. doi:10.1073/pnas.82.15.4910. PMC 390467. PMID 3927292. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=390467. 
  2. ^ a b "Entrez Gene: CTSD cathepsin D". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=1509. 
  3. ^ Wolf M, Clark-Lewis I, Buri C, Langen H, Lis M, Mazzucchelli L (April 2003). "Cathepsin D specifically cleaves the chemokines macrophage inflammatory protein-1 alpha, macrophage inflammatory protein-1 beta, and SLC that are expressed in human breast cancer". Am. J. Pathol. 162 (4): 1183–90. PMC 1851240. PMID 12651610. http://ajp.amjpathol.org/cgi/pmidlookup?view=long&pmid=12651610. 
  4. ^ Authier F, Métioui M, Fabrega S, Kouach M, Briand G (2002). "Endosomal proteolysis of internalized insulin at the C-terminal region of the B chain by cathepsin D". J. Biol. Chem. 277 (11): 9437–9446. doi:10.1074/jbc.M110188200. PMID 11779865. 
  5. ^ Lee Angela, Gulnik Sergei, Erickson John (1998). "Conformational switching in an aspartic proteinase". Nat.Struct.Mol.Biol. 5: 866–871. doi:10.1038/2306. 
  6. ^ Petsko Gregory, Ringe Dagmar (2004). Protein Structure and Function. ISBN 9781405119221. http://books.google.com/?id=2yRDWkHhN9QC&printsec=frontcover&dq=protein+structure+function+petsko#v=onepage&q=&f=false. 

External links

Further reading