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Nardilysin facilitates complex formation between mitochondrial malate dehydrogenase and citrate synthase
K Martin Chow1, Zhangliang Ma, Jian Cai
1Department of Molecular and Cellular Biochemistry, University of Kentucky, Chandler Medical Center, 800 Rose Street, Lexington, KY 40536-0298, United States. mchow1@uky.edu
Biochimica Et Biophysica Acta
|April 6, 2005
Summary
Nardilysin in rat brain extracts forms larger complexes, likely through its acidic domain. It interacts with mitochondrial malate dehydrogenase (mMDH) and facilitates citrate synthase (CS) complex formation.
Area of Science:
- Biochemistry
- Molecular Biology
- Neuroscience
Background:
- Nardilysin is an enzyme implicated in various cellular processes.
- Its native molecular state and interactions within complex biological extracts are not fully understood.
Purpose of the Study:
- To investigate the oligomeric state and protein interactions of nardilysin in rat brain extracts.
- To elucidate the role of nardilysin in the assembly of mitochondrial protein complexes.
Main Methods:
- Gel filtration chromatography to determine apparent molecular weight.
- Biochemical assays using purified nardilysin and GST fusion proteins.
- Affinity chromatography using an immobilized nardilysin column.
- Co-immunoprecipitation to assess protein complex formation.
Main Results:
- Nardilysin exists as a larger complex (~300 kDa) in rat brain extracts compared to its purified form (~187 kDa).
- Oligomerization appears to involve the acidic domain of nardilysin.
- Nardilysin interacts with mitochondrial malate dehydrogenase (mMDH) and stabilizes it against heat.
- Nardilysin facilitates the co-immunoprecipitation of citrate synthase (CS) with mMDH, indicating complex formation.
Conclusions:
- Nardilysin undergoes oligomerization in vivo, influenced by its acidic domain.
- Nardilysin plays a role in the assembly and stability of mitochondrial enzyme complexes, specifically involving mMDH and CS.