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Mitochondrial Fatty Acid Synthase Utilizes Multiple Acyl Carrier Protein Isoforms
Xinyu Fu1,2,3, Xin Guan1,2,3, Rachel Garlock1
1Roy J. Carver Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011.
Plant Physiology
|February 26, 2020
Summary
Three mitochondrial acyl carrier protein (ACP) isoforms in Arabidopsis support fatty acid synthesis. Loss of all three leads to embryo lethality, while loss of two causes growth defects and impaired metabolism.
Area of Science:
- Plant Molecular Biology
- Mitochondrial Metabolism
- Fatty Acid Biosynthesis
Background:
- Acyl carrier protein (ACP) is essential for Type II fatty acid synthases (FASs).
- Mitochondrial ACP (mtACP) isoforms are involved in plant metabolism.
Purpose of the Study:
- To investigate the physiological roles of three Arabidopsis mtACP isoforms.
- To understand the functional redundancy and importance of mtACPs in plant development and metabolism.
Main Methods:
- Generation and characterization of single, double, and triple mtACP mutants in Arabidopsis thaliana.
- Analysis of plant morphology, growth phenotypes, and metabolic alterations.
- Assessment of protein lipoylation and photorespiratory pathways.
Main Results:
- Single mtACP mutants showed no growth defects, indicating functional redundancy.
- Triple mutants exhibited embryo lethality, highlighting the essentiality of mtACPs.
- The mtACP1/mtACP2 double mutant displayed delayed growth, reduced protein lipoylation, and altered central carbon metabolism.
Conclusions:
- Mitochondrial ACP is crucial for fatty acid biosynthesis, providing precursors for lipoic acid.
- Impaired lipoylation of mitochondrial proteins, like Gly decarboxylase, affects photorespiratory carbon recovery and is critical for embryogenesis.
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