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Development and characterization of human and mouse specific antibodies to CuZn-superoxide dismutase (SOD1)
S E Bartlett1, R Singala, A Hashikawa
1Department of Physiology and Pharmacology, The University of Queensland, St Lucia, QLD 4072, Brisbane, Australia. selena.bartlett@anu.edu.au
Abstract:
Mutations in the copper/zinc superoxide dismutase (SOD1) gene are associated with 15-20% of the familial forms of motor neuron disease. Mice where a transgene has been incorporated that encodes for the human SOD1 mutation develop a form of motor neurone disease that closely resembles human forms of this disease. We have produced and characterized species-specific antibodies to epitopes in the SOD1 protein, amino acids 25-37, a region that distinguishes between the human and the mouse species of SOD1. The antisera generated were unable to immunoprecipitate the mouse or the human forms of SOD1 from tissue extracts unless the homodimeric complex of SOD1 was denatured. As SOD1 exists as a homodimeric complex in the cytoplasm of cells, this suggests that amino acids in position, 25-37 are close to the dimeric interface of SOD1.
Insights
Species-specific antibodies targeting the copper/zinc superoxide dismutase (SOD1) protein revealed that amino acids 25-37 are near the dimeric interface. This finding offers insights into SOD1
Area of Science:
- Biochemistry
- Neuroscience
- Genetics
Background:
- Mutations in the copper/zinc superoxide dismutase (SOD1) gene are linked to 15-20% of familial motor neuron disease.
- Transgenic mouse models with human SOD1 mutations mimic human motor neuron disease.
- SOD1 functions as a homodimeric complex in cellular cytoplasm.
Purpose of the Study:
- To generate and characterize species-specific antibodies against human and mouse SOD1.
- To investigate the location of the epitope (amino acids 25-37) within the SOD1 protein structure.
- To understand the structural implications of SOD1 mutations in motor neuron disease.
Main Methods:
- Production and characterization of species-specific antibodies targeting SOD1 epitopes (amino acids 25-37).
- Immunoprecipitation assays using generated antisera on mouse and human SOD1 from tissue extracts.
- Analysis of SOD1 complex integrity under denaturing and non-denaturing conditions.
Main Results:
- Generated antisera were specific to the target epitope distinguishing human and mouse SOD1.
- Immunoprecipitation was unsuccessful unless the SOD1 homodimeric complex was denatured.
- The epitope at amino acids 25-37 is located near the dimeric interface of the SOD1 protein.
Conclusions:
- The region of SOD1 encompassing amino acids 25-37 is proximal to the dimeric interface.
- This structural information is crucial for understanding SOD1's role in motor neuron disease pathogenesis.
- Further research can leverage these findings to develop targeted therapeutic strategies.