Abstract
Hereditary spastic paraplegia (HSP) is a genetically heterogeneous neurodegenerative disorder that is characterized by progressive and cell-specific axonal degeneration. An autosomal recessive form of the disease is caused by mutations in paraplegin, which is a conserved subunit of the ubiquitous and ATP-dependent m-AAA protease in mitochondria. The m-AAA protease carries out protein quality control in the inner membrane of the mitochondria, suggesting a pathogenic role of misfolded proteins in HSP. A recent study demonstrates that the m-AAA protease regulates ribosome assembly and translation within mitochondria by controlling proteolytic maturation of a ribosomal subunit. Here, we will discuss implications of the dual role of the m-AAA protease in protein activation and degradation for mitochondrial dysfunction and axonal degeneration.
Publication types
-
Research Support, Non-U.S. Gov't
-
Review
MeSH terms
-
ATPases Associated with Diverse Cellular Activities
-
Animals
-
Axons / enzymology*
-
Axons / pathology
-
Humans
-
Metalloendopeptidases / genetics
-
Metalloendopeptidases / metabolism*
-
Mice
-
Mice, Knockout
-
Mitochondria / enzymology*
-
Mitochondria / pathology
-
Mitochondrial Membranes / enzymology
-
Models, Animal
-
Mutation
-
Phenotype
-
Protein Folding
-
Ribosomal Proteins / genetics
-
Ribosomal Proteins / metabolism*
-
Saccharomyces cerevisiae Proteins / genetics
-
Saccharomyces cerevisiae Proteins / metabolism*
-
Spastic Paraplegia, Hereditary / enzymology*
-
Spastic Paraplegia, Hereditary / genetics
-
Spastic Paraplegia, Hereditary / pathology
Substances
-
MrpL32 protein, S cerevisiae
-
Ribosomal Proteins
-
Saccharomyces cerevisiae Proteins
-
Metalloendopeptidases
-
SPG7 protein, human
-
m-AAA proteases
-
ATPases Associated with Diverse Cellular Activities