Acyl modification and binding of mitochondrial ACP to multiprotein complexes
Heike Angerer1, Stefan Schönborn2, Jan Gorka2
1Goethe University Frankfurt, Medical School, Institute of Biochemistry II, Structural Bioenergetics Group, Max-von-Laue Str. 9, 60438 Frankfurt, Germany.
Mitochondrial acyl carrier proteins (ACPMs) are crucial for fatty acid synthesis and complex I function. Their interaction with LYR motif proteins is vital for complex assembly and stability.
Area of Science:
- Mitochondrial biology
- Protein biochemistry
- Enzyme complex assembly
Background:
- Mitochondrial acyl carrier protein (ACPM/NDUFAB1) is key to fatty acid synthesis type II.
- ACPM's role as a respiratory complex I subunit was previously unclear.
- Yarrowia lipolytica's Complex I has two ACPMs (ACPM1, ACPM2) linked by LYRM subunits.
Purpose of the Study:
- Investigate the function and interactions of ACPMs in yeast Complex I.
- Elucidate the role of ACPM-LYRM interactions in complex assembly and activity.
- Determine the structural basis for ACPM-LYRM association.
Main Methods:
- Protein complex isolation and characterization.
- Yeast genetics and molecular biology techniques.
- Biochemical assays for complex I activity and assembly.
Main Results:
- ACPM1 exists both bound to Complex I and as a free protein.
- ACPM1 also forms complexes with LYRM4(ISD11)/NFS1 involved in Fe-S cluster biogenesis.
- A long acyl chain on the phosphopantetheine cofactor is essential for ACPM docking to protein complexes.
- A novel protein-protein interaction motif mediating ACPM-LYRM association is proposed.
Conclusions:
- ACPMs have multifaceted roles beyond fatty acid synthesis, including Complex I assembly and Fe-S cluster biogenesis.
- Specific ACPM-LYRM interactions are critical for Complex I function and stability.
- A conserved interaction motif likely governs ACPM-LYRM binding across different protein complexes.
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