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Purification and immunochemical interrelationship of cytosolic and mitochondrial monoamine oxidase from rat brain
1Hormone and Drug Research Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Abstract:
Monoamine oxidase (MAO) was purified to homogenity from the cytosolic (105,000 g supernatant) and mitochondrial fractions of the rat brain. Antisera were raised against MAO preparations and enzyme-linked immunosorbent assay was developed for its sensitivity and immunochemical cross reactivity. The comparison of two forms of monoamine oxidase was based on a displacement ELISA, where antisera were interchanged on predetermined optimal dilutions. Both forms of the enzyme showed immunological cross reactivity. When cytosolic MAO preparation was coated and heterologous antisera were used, the cross reactivity was 36%. With mitochondrial MAO, on the other hand, heterologous antisera gave only 2.2% cross reactivity. This demonstrated that both forms of MAO possess a large number of unique antigenic determinants, thereby implying a structural difference.
Insights
Researchers purified two forms of monoamine oxidase (MAO) from rat brains. Immunological assays revealed significant structural differences between cytosolic and mitochondrial MAO, indicating distinct antigenic determinants.
Area of Science:
- Biochemistry
- Neuroscience
- Immunology
Background:
- Monoamine oxidase (MAO) is crucial for neurotransmitter metabolism.
- MAO exists in cytosolic and mitochondrial forms with distinct functions.
- Understanding MAO structural differences is key to its biological roles.
Purpose of the Study:
- To purify and compare cytosolic and mitochondrial MAO from rat brains.
- To assess the immunological relatedness and structural differences between MAO forms.
- To develop sensitive immunoassays for MAO characterization.
Main Methods:
- Purification of MAO from rat brain cytosolic and mitochondrial fractions.
- Generation of antisera against MAO preparations.
- Development and application of enzyme-linked immunosorbent assay (ELISA) for cross-reactivity analysis.
Main Results:
- Both MAO forms exhibited immunological cross-reactivity.
- Cytosolic MAO showed 36% cross-reactivity with heterologous antisera.
- Mitochondrial MAO displayed only 2.2% cross-reactivity with heterologous antisera.
Conclusions:
- Significant structural differences exist between cytosolic and mitochondrial MAO.
- The distinct antigenic determinants suggest divergent evolutionary paths or functional specializations.
- Immunological comparison provides a sensitive method for probing protein structural variations.
