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The tricarboxylic acid cycle in L3 Teladorsagia circumcincta: metabolism of acetyl CoA to succinyl CoA
Citation
Simcock, DC and Walker, LR and Pedley, KC and Simpson, HV and Brown, S, The tricarboxylic acid cycle in L3 Teladorsagia circumcincta: metabolism of acetyl CoA to succinyl CoA, Experimental Parasitology, 128, (1) pp. 68-75. ISSN 0014-4894 (2011) [Refereed Article]
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Copyright Statement
Copyright 2011 Elsevier Inc.
DOI: doi:10.1016/j.exppara.2011.02.008
Abstract
Nematodes, like other species, derive much of the energy for cellular processes from mitochondrial pathways including the TCA cycle. Previously, we have shown L3 Teladorsagia circumcincta consume oxygen and so may utilise a full TCA cycle for aerobic energy metabolism. We have assessed the relative activity levels and substrate affinities of citrate synthase, aconitase, isocitrate dehydrogenase (both NAD+ and NADP+ specific) and α-ketoglutarate dehydrogenase in homogenates of L3 T. circumcincta. All of these enzymes were present in homogenates. Compared with citrate synthase, low levels of enzyme activity and low catalytic efficiency was observed for NAD+ isocitrate dehydrogenase and especially α-ketoglutarate dehydrogenase. Therefore, it is likely that the activity of these to enzymes regulate overall metabolite flow through the TCA cycle, especially when [NAD+] limits enzyme activity. Of the enzymes tested, only citrate synthase had substrate affinities which were markedly different from values obtained from mammalian species. Overall, the results are consistent with the suggestion that a full TCA cycle exists within L3 T. circumcincta. While there may subtle variations in enzyme properties, particularly for citrate synthase, the control points for the TCA cycle in L3 T. circumcincta are probably similar to those in the tissues of their host species.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | TCA cycle, nematode, citrate synthase, aconitase, isocitrate dehydrogenase, alpha-ketoglutarate dehydrogenase, Teladorsagia circumcincta |
| Research Division: | Biological Sciences |
| Research Group: | Biochemistry and Cell Biology |
| Research Field: | Enzymes |
| Objective Division: | Animal Production and Animal Primary Products |
| Objective Group: | Livestock Raising |
| Objective Field: | Sheep - Meat |
| UTAS Author: | Brown, S (Dr Simon Brown) |
| ID Code: | 75729 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 3 |
| Deposited By: | Health Sciences A |
| Deposited On: | 2012-02-13 |
| Last Modified: | 2013-02-05 |
| Downloads: | 1 View Download Statistics |
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