scholarly journals Computational Redesign of Acyl-ACP Thioesterase with Improved Selectivity toward Medium-Chain-Length Fatty Acids

ACS Catalysis ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3837-3849 ◽  
Author(s):  
Matthew J. Grisewood ◽  
Néstor J. Hernández-Lozada ◽  
James B. Thoden ◽  
Nathanael P. Gifford ◽  
Daniel Mendez-Perez ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Chain Length ◽  
Medium Chain ◽  
Medium Chain Length

scholarly journals Effects of propionate and carnitine on the hepatic oxidation of short- and medium-chain-length fatty acids

1988 ◽  
Vol 250 (3) ◽  
pp. 819-825 ◽  
Author(s):  
E P Brass ◽  
R A Beyerinck
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Organic Acid ◽  
Chain Length ◽  
Ketone Body ◽  
Acetyl Coa ◽  
Body Formation ◽  
Medium Chain ◽  
Medium Chain Length ◽  
Hepatic Oxidation

Accumulation of propionate, or its metabolic product propionyl-CoA, can disrupt normal cellular metabolism. The present study examined the effects of propionate, or propionyl-CoA generated during the oxidation of odd-chain-length fatty acids, on hepatic oxidation of short- and medium-chain-length fatty acids. In isolated hepatocytes, ketone-body formation from odd-chain-length fatty acids was slow as compared with even-chain-length fatty acid substrates, and increased as the carbon chain length was increased from five to seven to nine. In contrast, rates of ketogenesis from butyrate, hexonoate and octanoate were all approximately equal. Propionate (10 mM) inhibited ketogenesis from butyrate, hexanoate and octanoate by 81%, 53% and 18% respectively. Addition of carnitine had no effect on ketogenesis from the even-chain-length fatty acids, but increased the rate of ketone-body formation from pentanoate (by 53%), heptanoate (by 28%) and from butyrate or hexanoate in the presence of propionate. The inhibitory effect of propionate could not be explained by shunting acetyl-CoA into the tricarboxylic acid cycle, as CO2 formation from butyrate was also decreased by propionate. Examination of the hepatocyte CoA pool during oxidation of butyrate demonstrated that addition of propionate decreased acetyl-CoA and CoA as propionyl-CoA accumulated. Addition of carnitine decreased propionyl-CoA by 50% (associated with production of propionylcarnitine) and increased acetyl-CoA and CoA. Similar changes in the CoA pool were seen during the oxidation of pentanoate. These results demonstrate that accumulation of propionyl-CoA results in inhibition of short-chain fatty acid oxidation. Carnitine can partially reverse this inhibition. Changes in the hepatocyte CoA pool are consistent with carnitine acting by generating propionylcarnitine, thereby decreasing propionyl-CoA and increasing availability of free CoA. The data provide further evidence of the potential cellular toxicity from organic acid accretion, and supports the concept that carnitine's interaction with the cellular CoA pool can have a beneficial effect on cellular metabolism and function under conditions of unusual organic acid accumulation.

scholarly journals Quantitative ‘Omics Analyses of Medium Chain Length Polyhydroxyalkanaote Metabolism in Pseudomonas putida LS46 Cultured with Waste Glycerol and Waste Fatty Acids

PLoS ONE ◽  
2015 ◽  
Vol 10 (11) ◽  
pp. e0142322 ◽  
Author(s):  
Jilagamazhi Fu ◽  
Parveen Sharma ◽  
Vic Spicer ◽  
Oleg V. Krokhin ◽  
Xiangli Zhang ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Pseudomonas Putida ◽  
Chain Length ◽  
Medium Chain ◽  
Waste Glycerol ◽  
Medium Chain Length

Renewable Long-Chain Fatty Acids for Production of Biodegradable Medium-Chain-Length Polyhydroxyalkanoates (mcl-PHAs) at Laboratory and Pilot Plant Scales

2000 ◽  
Vol 33 (13) ◽  
pp. 4690-4698 ◽  
Author(s):  
Michele B. Kellerhals ◽  
Birgit Kessler ◽  
Bernard Witholt ◽  
Alexandre Tchouboukov ◽  
Helmut Brandl
Keyword(s):  
Fatty Acids ◽  
Chain Length ◽  
Pilot Plant ◽  
Long Chain Fatty Acids ◽  
Medium Chain ◽  
Medium Chain Length ◽  
Long Chain ◽  
Chain Fatty Acids

scholarly journals Biosynthesis and Elongation of Short- and Medium-Chain-Length Fatty Acids

2000 ◽  
Vol 122 (1) ◽  
pp. 275-282 ◽  
Author(s):  
Rutger S. van der Hoeven ◽  
John C. Steffens
Keyword(s):  
Fatty Acids ◽  
Chain Length ◽  
Medium Chain ◽  
Medium Chain Length
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