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By W.E. Gutteridge

ISBN-10: 0333227794

ISBN-13: 9780333227794

ISBN-10: 1349158097

ISBN-13: 9781349158096

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The combined activity of the two enzymes L-aglycerophosphate dehydrogenase and L-a-glycerophosphate oxidase reoxidises NADH and produces water. Cyanide has no effect and there is no linked energy production. As far as is known, this system is unique to salivarian trypanosomes. The L-a-glycerophosphate dehydrogenase is possibly localised together with all the glycolytk enzymes from hexokinase to 3-phosphoglycerate kinase in microbodies and is probably not membrane bound. The enzyme from Trypanosoma brucei is similar to those present in T.

2). These storage lipids usually occur as CATABOLISM. 1 The structure of a-D-glucose. 2 The structure of part of a glycogen molecule demonstrating a(l - 4) and a(l - 6) glycosidic linkages. fat droplets and in mammals are especially common in adipose tissue. Synthesis of fatty acids occurs in the cytoplasm of cells, whereas catabolism occurs in mitochondria. Lipid metabolism is considered in more detail in chapter 8. Both glycogen and triacylglycerols normally are synthesised in times of abundant energy availability.

The enzyme from Trypanosoma brucei is similar to those present in T. vivax, Crithidia and Leptomonas, but rather different in detail from the enzymes of mammals and birds. The Lra-glycerophosphate oxidase is a particulate enzyme, possibly with several components, contains iron and copper, and is now known to be localised in the mitochondria. High oxygen tensions are required by the system (Km approximately 2 ,uM). The absence of a parallel system in mammals makes the trypanosoma! L-aglycerophosphate oxidase enzyme a prime target for rational chemotherapy.

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Biochemistry of Parasitic Protozoa by W.E. Gutteridge


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