Article ; Online: Structural basis for defective membrane targeting of mutant enzyme in human VLCAD deficiency.
2022 Volume 13, Issue 1, Page(s) 3669
Abstract: Very long-chain acyl-CoA dehydrogenase (VLCAD) is an inner mitochondrial membrane enzyme that catalyzes the first and rate-limiting step of long-chain fatty acid oxidation. Point mutations in human VLCAD can produce an inborn error of metabolism called ... ...
Abstract | Very long-chain acyl-CoA dehydrogenase (VLCAD) is an inner mitochondrial membrane enzyme that catalyzes the first and rate-limiting step of long-chain fatty acid oxidation. Point mutations in human VLCAD can produce an inborn error of metabolism called VLCAD deficiency that can lead to severe pathophysiologic consequences, including cardiomyopathy, hypoglycemia, and rhabdomyolysis. Discrete mutations in a structurally-uncharacterized C-terminal domain region of VLCAD cause enzymatic deficiency by an incompletely defined mechanism. Here, we conducted a structure-function study, incorporating X-ray crystallography, hydrogen-deuterium exchange mass spectrometry, computational modeling, and biochemical analyses, to characterize a specific membrane interaction defect of full-length, human VLCAD bearing the clinically-observed mutations, A450P or L462P. By disrupting a predicted α-helical hairpin, these mutations either partially or completely impair direct interaction with the membrane itself. Thus, our data support a structural basis for VLCAD deficiency in patients with discrete mutations in an α-helical membrane-binding motif, resulting in pathologic enzyme mislocalization. |
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MeSH term(s) | Acyl-CoA Dehydrogenase, Long-Chain/genetics ; Acyl-CoA Dehydrogenase, Long-Chain/metabolism ; Congenital Bone Marrow Failure Syndromes/genetics ; Humans ; Lipid Metabolism, Inborn Errors/genetics ; Lipid Metabolism, Inborn Errors/metabolism ; Mitochondrial Diseases/genetics ; Muscular Diseases |
Chemical Substances | Acyl-CoA Dehydrogenase, Long-Chain (EC 1.3.8.8) |
Language | English |
Publishing date | 2022-06-27 |
Publishing country | England |
Document type | Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural |
ZDB-ID | 2553671-0 |
ISSN | 2041-1723 ; 2041-1723 |
ISSN (online) | 2041-1723 |
ISSN | 2041-1723 |
DOI | 10.1038/s41467-022-31466-2 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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