Document Detail


The peroxisomal Acyl-CoA thioesterase Pte1p from Saccharomyces cerevisiae is required for efficient degradation of short straight chain and branched chain fatty acids.
MedLine Citation:
PMID:  16490786     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The role of the Saccharomyces cerevisae peroxisomal acyl-coenzyme A (acyl-CoA) thioesterase (Pte1p) in fatty acid beta-oxidation was studied by analyzing the in vitro kinetic activity of the purified protein as well as by measuring the carbon flux through the beta-oxidation cycle in vivo using the synthesis of peroxisomal polyhydroxyalkanoate (PHA) from the polymerization of the 3-hydroxyacyl-CoAs as a marker. The amount of PHA synthesized from the degradation of 10-cis-heptadecenoic, tridecanoic, undecanoic, or nonanoic acids was equivalent or slightly reduced in the pte1Delta strain compared with wild type. In contrast, a strong reduction in PHA synthesized from heptanoic acid and 8-methyl-nonanoic acid was observed for the pte1Delta strain compared with wild type. The poor catabolism of 8-methyl-nonanoic acid via beta-oxidation in pte1Delta negatively impacted the degradation of 10-cis-heptadecenoic acid and reduced the ability of the cells to efficiently grow in medium containing such fatty acids. An increase in the proportion of the short chain 3-hydroxyacid monomers was observed in PHA synthesized in pte1Delta cells grown on a variety of fatty acids, indicating a reduction in the metabolism of short chain acyl-CoAs in these cells. A purified histidine-tagged Pte1p showed high activity toward short and medium chain length acyl-CoAs, including butyryl-CoA, decanoyl-CoA and 8-methyl-nonanoyl-CoA. The kinetic parameters measured for the purified Pte1p fit well with the implication of this enzyme in the efficient metabolism of short straight and branched chain fatty acyl-CoAs by the beta-oxidation cycle.
Authors:
Isamu Maeda; Syndie Delessert; Seiko Hasegawa; Yoshiaki Seto; Sophie Zuber; Yves Poirier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-02-20
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  281     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-04-24     Completed Date:  2006-07-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  11729-35     Citation Subset:  IM    
Affiliation:
Department of Bioproductive Science, Faculty of Agriculture, Utsunomiya University, 350 Minemachi, Utsunomiya 321-8505, Japan.
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MeSH Terms
Descriptor/Qualifier:
Acyl Coenzyme A / metabolism*
Fatty Acids / chemistry,  metabolism*
Hydroxybutyrates / metabolism
Kinetics
Oxidation-Reduction
Peroxisomes / enzymology*
Saccharomyces cerevisiae / metabolism*
Thiolester Hydrolases / chemistry,  genetics*,  metabolism*
Chemical
Reg. No./Substance:
0/Acyl Coenzyme A; 0/Fatty Acids; 0/Hydroxybutyrates; EC 3.1.2.-/Thiolester Hydrolases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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