Cathepsin D Protein (Ctsd) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
This page provides comprehensive information about Cathepsin D Protein, including its structure, normal function in the nervous system, and its role in neurodegenerative diseases.
:: infobox infobox-protein
!Protein Name | Cathepsin D (CTSD)
!Gene | CTSD
!UniProt ID | P07339
!PDB Structure | 1LYA, 4OBZ, 5W76
!Molecular Weight | ~26 kDa (light chain) + ~14 kDa (heavy chain after processing)
!Subcellular Localization | Lysosomes, endosomes
!Protein Family | Aspartic cathepsins (pepsin family)
!
Cathepsin D is an aspartic protease with a bilobed structure:
The active enzyme is a heterodimer generated by proteolytic processing in lysosomes. The two catalytic aspartates form the active site that hydrolyzes peptide bonds.
Cathepsin D has essential cellular functions:
Protein Degradation: Major lysosomal protease, particularly for intracellular protein turnover
Autophagy: Essential for autophagosome-lysosome fusion and degradation
Apoptosis: Can cleave pro-apoptotic proteins and generate pro-death fragments
Extracellular Matrix: Degrades ECM components during tissue remodeling
Precursor Processing: Activates other hydrolases and processes pro-hormones
Cathepsin D is heavily implicated in AD pathogenesis:
| Approach | Status | Description |
|---|---|---|
| Cathepsin D Inhibitors | Preclinical | Modulate Aβ generation |
| Gene Therapy | Preclinical | AAV-CTSD for Batten disease |
| Activity Modulators | Research | Enhance clearance function |
Hope AD, et al. (1993) "Cathepsin D: An important factor in Alzheimer's disease." Adv Exp Med Biol 351:39-47.
Saftig P, et al. (2008) "Functions of cathepsin D in endosomal and lysosomal protein degradation." Biochim Biophys Acta 1793:605-614.
Kh MT, et al. (2021) "Cathepsin D and its role in neurodegenerative diseases." Ageing Res Rev 67:101265. DOI:10.1016/j.arr.2021.101265
Stoka V, et al. (2016) "Lysosomal cathepsin D - Structure, function, and therapeutic implications." Mol Aspects Med 45:48-58.
The study of Cathepsin D Protein (Ctsd) has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] Reference 1
[2] Reference 2
[3] Reference 3