Impact of the intramitochondrial enzyme organization on fatty acid oxidation

2001 ◽  
Vol 29 (2) ◽  
pp. 279-282 ◽  
Author(s):  
X. Liang ◽  
W. Le ◽  
D. Zhang ◽  
H. Schulz
Keyword(s):  
Acid Oxidation ◽  
Matrix System ◽  
Apparent Absence ◽  
Substrate Specificities ◽  
Chain Acyl ◽  
Membrane Bound ◽  
Enzyme Organization ◽  
Soluble Enzymes ◽  
Oxidation System ◽  
Long Chain

The enzymes of mitochondrial β-oxidation are thought to be organized in at least two functional complexes, a membrane-bound, long-chain-specific β-oxidation system and a matrix system consisting of soluble enzymes with preferences for medium-chain and short-chain substrates. This hypothesis is supported by the observation that the inactivation of long-chain 3-ketoacyl-CoA thiolase by 4-bromotiglic acid (4-bromo-2-methylbut-2-enoic acid) causes the complete inhibition of palmitate β-oxidation even though 3-ketoacyl-CoA thiolase, which acts on 3-ketopalmitoyl-CoA, remains partly active. The observed substrate specificities of long-chain acyl-CoA dehydrogenase (LCAD) and very-long-chain acyl-CoA dehydrogenase prompt the suggestion that LCAD is a functional component of the long-chain-specific β-oxidation system. Altogether, a view is emerging of the organization of β-oxidation enzymes in mitochondria that supports the idea of intermediate channelling and explains the apparent absence of true intermediates of β-oxidation from mitochondria.

scholarly journals ABC Transporter Subfamily D: Distinct Differences in Behavior between ABCD1–3 and ABCD4 in Subcellular Localization, Function, and Human Disease

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Kosuke Kawaguchi ◽  
Masashi Morita
Keyword(s):  
Abc Transporters ◽  
Critical Role ◽  
Vitamin B ◽  
Long Chain Fatty Acids ◽  
Substrate Specificities ◽  
Related Disease ◽  
Chain Acyl ◽  
Membrane Bound ◽  
Branched Chain ◽  
Long Chain

ATP-binding cassette (ABC) transporters are one of the largest families of membrane-bound proteins and transport a wide variety of substrates across both extra- and intracellular membranes. They play a critical role in maintaining cellular homeostasis. To date, four ABC transporters belonging to subfamily D have been identified. ABCD1–3 and ABCD4 are localized to peroxisomes and lysosomes, respectively. ABCD1 and ABCD2 are involved in the transport of long and very long chain fatty acids (VLCFA) or their CoA-derivatives into peroxisomes with different substrate specificities, while ABCD3 is involved in the transport of branched chain acyl-CoA into peroxisomes. On the other hand, ABCD4 is deduced to take part in the transport of vitamin B12from lysosomes into the cytosol. It is well known that the dysfunction of ABCD1 results in X-linked adrenoleukodystrophy, a severe neurodegenerative disease. Recently, it is reported that ABCD3 and ABCD4 are responsible for hepatosplenomegaly and vitamin B12deficiency, respectively. In this review, the targeting mechanism and physiological functions of the ABCD transporters are summarized along with the related disease.

Primary and Secondary Carnitine Deficiency Syndromes

1995 ◽  
Vol 10 (2_suppl) ◽  
pp. 2S8-2S24 ◽  
Author(s):  
Roser Pons ◽  
Darryl C. De Vivo
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Mitochondrial Membrane ◽  
Carnitine Deficiency ◽  
Carnitine Palmitoyltransferase ◽  
Acid Oxidation ◽  
Inner Mitochondrial Membrane ◽  
Chain Acyl ◽  
Membrane Bound ◽  
Long Chain

The objective of this article is to review primary and secondary causes of carnitine deficiency, emphasizing recent advances in our knowledge of fatty acid oxidation. It is now understood that the cellular metabolism of fatty acids requires the cytosolic carnitine cycle and the mitochondrial β-oxidation cycle. Carnitine is central to the translocation of the long chain acyl-CoAs across the inner mitochondrial membrane. The mitochondrial β-oxidation cycle is composed of a newly described membrane-bound system and the classic matrix compartment system. Very long chain acyl-CoA dehydrogenase and the trifunctional enzyme complex are embedded in the inner mitochondrial membrane, and metabolize the long chain acyl-CoAs. The chain shortened acyl-CoAs are further degraded by the well-known system in the mitochondrial matrix. Numerous metabolic errors have been described in the two cycles of fatty acid oxidation; all are transmitted as autosomal recessive traits. Primary or secondary carnitine deficiency is present in all these clinical conditions except carnitine palmitoyltransferase type I and the classic adult form of carnitine palmitoyltransferase type II deficiency. The sole example of primary carnitine deficiency is the genetic defect involving the active transport across the plasmalemmal membrane. This condition responds dramatically to oral carnitine therapy. The secondary carnitine deficiencies respond less obviously to carnitine replacement. These conditions are managed by high carbohydrate, low fat frequent feedings, and vitamin/cofactor supplementation (eg, carnitine, glycine, and riboflavin). Medium chain triglycerides may be useful in the dietary management of patients with inborn errors of the cytosolic carnitine cycle or the mitochondrial membrane-bound long chain specific β-oxidation system. (J Child Neurol 1995;10(Suppl):2S8-2S24).

scholarly journals Recent Advances in the Pathophysiology of Fatty Acid Oxidation Defects: Secondary Alterations of Bioenergetics and Mitochondrial Calcium Homeostasis Caused by the Accumulating Fatty Acids

2020 ◽  
Vol 11 ◽  
Author(s):  
Alexandre Umpierrez Amaral ◽  
Moacir Wajner
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Calcium Homeostasis ◽  
Acid Oxidation ◽  
Cultured Fibroblasts ◽  
Medium Chain ◽  
Chain Acyl ◽  
Energy Deprivation ◽  
Long Chain

Deficiencies of medium-chain acyl-CoA dehydrogenase, mitochondrial trifunctional protein, isolated long-chain 3-hydroxyacyl-CoA dehydrogenase, and very long-chain acyl-CoA dehydrogenase activities are considered the most frequent fatty acid oxidation defects (FAOD). They are biochemically characterized by the accumulation of medium-chain, long-chain hydroxyl, and long-chain fatty acids and derivatives, respectively, in tissues and biological fluids of the affected patients. Clinical manifestations commonly include hypoglycemia, cardiomyopathy, and recurrent rhabdomyolysis. Although the pathogenesis of these diseases is still poorly understood, energy deprivation secondary to blockage of fatty acid degradation seems to play an important role. However, recent evidence indicates that the predominant fatty acids accumulating in these disorders disrupt mitochondrial functions and are involved in their pathophysiology, possibly explaining the lactic acidosis, mitochondrial morphological alterations, and altered mitochondrial biochemical parameters found in tissues and cultured fibroblasts from some affected patients and also in animal models of these diseases. In this review, we will update the present knowledge on disturbances of mitochondrial bioenergetics, calcium homeostasis, uncoupling of oxidative phosphorylation, and mitochondrial permeability transition induction provoked by the major fatty acids accumulating in prevalent FAOD. It is emphasized that further in vivo studies carried out in tissues from affected patients and from animal genetic models of these disorders are necessary to confirm the present evidence mostly achieved from in vitro experiments.

scholarly journals Medium-Chain Acyl-CoA Dehydrogenase Deficiency in an Infant with Dilated Cardiomyopathy

2009 ◽  
Vol 2009 ◽  
pp. 1-3 ◽  
Author(s):  
Marcello Marcì ◽  
Patrizia Ajovalasit
Keyword(s):  
Fatty Acid ◽  
Dilated Cardiomyopathy ◽  
Dehydrogenase Deficiency ◽  
Acid Oxidation ◽  
Inherited Disorders ◽  
Mitochondrial Fatty Acid Oxidation ◽  
Medium Chain ◽  
Mitochondrial Fatty Acid ◽  
Chain Acyl ◽  
Long Chain

We report about an infant affected by dilated cardiomyopathy (CMP) in whom metabolic investigations evidenced medium-chain-acyl-CoA dehydrogenase deficiency (MCADD), that is one of three types of inherited disorders of mitochondrial fatty-acid -oxidation. Long-chain and very long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficits are recognized as responsible of hypertrophic or, less frequently, dilated cardiomyopathy (CMP) in childhood. Otherwise, to our knowledge, no case of MCADD associated to dilated CMP has been reported in literature.

Hypoglycemia, Hypotonia, and Cardiomyopathy: The Evolving Clinical Picture of Long-Chain Acyl-CoA Dehydrogenase Deficiency

PEDIATRICS ◽  
1991 ◽  
Vol 87 (3) ◽  
pp. 328-333 ◽  
Author(s):  
William R. Treem ◽  
Jeffrey S. Hyams ◽  
Charles A. Stanley ◽  
Daniel E. Hale ◽  
Harris B. Leopold
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Dehydrogenase Deficiency ◽  
Response To Treatment ◽  
Acid Oxidation ◽  
Medium Chain ◽  
Chain Acyl ◽  
History Of ◽  
Related Enzyme ◽  
Long Chain

Inherited defects in fatty acid oxidation, which have been described and diagnosed with increasing frequency in the last decade, are most commonly attributed to a deficiency in the activity of medium-chain acyl-CoA dehydrogenase. Few cases of the related enzyme defect of long-chain acyl-CoA dehydrogenase activity have been reported. An infant with documented long-chain acyl-CoA dehydrogenase deficiency is described with a detailed metabolic profile, long-term clinical follow-up, and response to treatment. This patient is compared with the seven previously published cases of this disorder in order to stress the unique features of the initial presentation, more subtle late manifestations of the disease, and clinical and biochemical differentiation from the more common medium-chain acyl-CoA dehydrogenase deficiency. This report stresses the enlarging spectrum of the clinical presentation and natural history of this defect in fatty acid oxidation.

scholarly journals Targeted disruption of mouse long-chain acyl-CoA dehydrogenase gene reveals crucial roles for fatty acid oxidation

1998 ◽  
Vol 95 (26) ◽  
pp. 15592-15597 ◽  
Author(s):  
D. M. Kurtz ◽  
P. Rinaldo ◽  
W. J. Rhead ◽  
L. Tian ◽  
D. S. Millington ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Acid Oxidation ◽  
Targeted Disruption ◽  
Dehydrogenase Gene ◽  
Chain Acyl ◽  
Long Chain
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