Abstract
The ubiquitous distribution of lysosomes and their heterogeneous protein composition reflects the versatility of these organelles in maintaining cell homeostasis and their importance in tissue differentiation and remodeling. In lysosomes, the degradation of complex, macromolecular substrates requires the synergistic action of multiple hydrolases that usually work in a stepwise fashion. This catalytic machinery explains the existence of lysosomal enzyme complexes that can be dynamically assembled and disassembled to efficiently and quickly adapt to the pool of substrates to be processed or degraded, adding extra tiers to the regulation of the individual protein components. An example of such a complex is the one composed of three hydrolases that are ubiquitously but differentially expressed: the serine carboxypeptidase, protective protein/cathepsin A (PPCA), the sialidase, neuraminidase-1 (NEU1), and the glycosidase β-galactosidase (β-GAL). Next to this ‘core’ complex, the existence of sub-complexes, which may contain additional components, and function at the cell surface or extracellularly, suggests as yet unexplored functions of these enzymes. Here we review how studies of basic biological processes in the mouse models of three lysosomal storage disorders, galactosialidosis, sialidosis, and GM1-gangliosidosis, revealed new and unexpected roles for the three respective affected enzymes, Ppca, Neu1, and β-Gal, that go beyond their canonical degradative activities. These findings have broadened our perspective on their functions and may pave the way for the development of new therapies for these lysosomal storage disorders.
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Abbreviations
- ASMC:
-
Aortic smooth muscle cell
- BiP:
-
Binding immunoglobulin protein
- β-GAL:
-
β-Galactosidase
- BM:
-
Bone marrow
- CHOP:
-
CCAAT/enhancer-binding protein homologous protein
- CMA:
-
Chaperone-mediated autophagy
- EBP:
-
Elastin-binding protein
- ECM:
-
Extracellular matrix
- EMH:
-
Extramedullary hematopoiesis
- ER:
-
Endoplasmic reticulum
- GALNS:
-
N-acetylgalactosamine-6-sulfate sulfatase
- GEMs:
-
Glysosphingolipid-enriched microdomains
- GM1:
-
GM1-gangliosidosis
- GPCR:
-
Guanine protein-coupled receptor
- GS:
-
Galactosialidosis
- Hsp:
-
Heat shock protein
- IGF-1R:
-
Insulin-like growth factor 1 receptor
- IP3R:
-
Inositol trisphosphate receptor
- JNK:
-
c-Jun N-terminal kinases
- LAMP:
-
Lysosomal membrane-associated protein
- LM:
-
Lysosomal membrane
- LMC:
-
Lysosomal multienzyme complex
- LPS:
-
Lipopolysaccharide
- LSD:
-
Lysosomal storage disorder
- MAMs:
-
Mitochondria-associated ER membranes
- MAPK/ERK:
-
Mitogen-activated protein kinase
- MAP2K/MEK:
-
Mitogen-activated protein kinase kinase
- MPP:
-
Metalloproteinase
- MyD88:
-
Myeloid differentiation primary response gene (88)
- NEU1:
-
Neuraminidase-1
- NF-κB:
-
Nuclear factor kappa-light-chain-enhancer of activated B cells
- PDGF-R:
-
Platelet-derived growth factor receptor
- PI3K:
-
Phosphoinositide 3-kinase
- PLCγ:
-
Phospholipase C gamma
- PM:
-
Plasma membrane
- PPCA:
-
Protective protein/cathepsin A
- Ras:
-
Rapidly accelerated fibrosarcoma
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick end labeling
- UPR:
-
Unfolded protein response
- VCAM1:
-
Vascular cell adhesion molecule 1
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Acknowledgments
We thank Dr. Angela McArthur for editing this manuscript. A.d’A. holds the Jewelers for Children Endowed Chair in Genetics and Gene Therapy. Work from d’Azzo’s laboratory that is included in this review was supported by the National Institutes of Health (NIH) grants GM60905 and DK52025, the Assisi Foundation of Memphis, the American Lebanese Syrian Associated Charities (ALSAC) and the National Tay-Sachs & Allied Disease Association (NTSAD).
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Bonten, E.J., Annunziata, I. & d’Azzo, A. Lysosomal multienzyme complex: pros and cons of working together. Cell. Mol. Life Sci. 71, 2017–2032 (2014). https://doi.org/10.1007/s00018-013-1538-3
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DOI: https://doi.org/10.1007/s00018-013-1538-3