NDLI: Isoalloxazine Ring of FAD Is Required for the Formation of the Core in the Hsp60-assisted Folding of Medium Chain Acyl-CoA Dehydrogenase Subunit into the Assembly Competent Conformation in Mitochondria

Content Provider	Journal of Biological Chemistry (JBC)
Author	Saijo, Takahiko Tanaka, Kay
Abstract	We studied the role of FAD in the intramitochondrial folding and assembly of medium-chain acyl-CoA dehydrogenase (MCAD), a homotetrameric mitochondrial enzyme containing a molecule of non-covalently bound FAD/monomer. In the MCAD molecule, FAD is buried in a crevice containing the active center. We have previously shown that upon import into mitochondria, newly processed MCAD is first incorporated into a high molecular weight (hMr) complex and that the hMr complex mainly consisted of MCAD-heat-shock protein 60 (hsp60) complex (Saijo, T., Welch, W. J., and Tanaka, K(1994) J. Biol. Chem. 269, 4401-4408). In the present study, we incubated in vitro synthesized precursor MCAD with mitochondria isolated from normal and riboflavin-deficient rat liver for 10-60 min and fractionated the solubilized mitochondria using gel filtration. The amount of MCAD in the hMr complex was larger and that of tetramer was smaller in riboflavin-deficient mitochondria than in control at any time point. In addition, riboflavin-deficient mitochondria were solubilized after 10-min import in a buffer containing ATP and were chased in the presence of FAD, FMN, or NAD or without any addition. The mitochondrial proteins were analyzed using gel filtration or immunoprecipitated with anti-hsp60 antibody. After 60-min chase in the presence of FAD, the majority of MCAD in the complex with hsp60 was transferred to tetramer, whereas no such transfer occurred after the chase in the absence of FAD. When chase was done in the presence of FMN, a significant amount of MCAD was transferred from the complex with hsp60 to tetramer, but the transfer was not as efficient as in the presence of FAD. The chase in the presence of NAD resulted in no transfer. These data suggest that isoalloxazine ring of FAD plays a critical role, exerting nucleating effect, in the hsp60-assisted folding of MCAD subunit into an assembly competent conformation, probably assisting the formation of the core.
Related Links	http://www.jbc.org/content/270/4/1899.abstract
Ending Page	1907
Starting Page	1899
Page Count	9
File Format	HTM / HTML PDF
ISSN	00219258
Journal	Journal of Biological Chemistry (JBC)
Issue Number	4
Volume Number	270
DOI	10.1074/jbc.270.4.1899
e-ISSN	1083351X
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	1995-01-27
Access Restriction	Open
Subject Keyword	Nucleic Acids, Protein Synthesis, and Molecular Genetics
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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