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D. F. Ellison Nash 《BMJ (Clinical research ed.)》1938,2(4057):764-765
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Studies on the kinetics and mechanism of orthophosphate activation of bovine brain hexokinase 总被引:1,自引:0,他引:1
W R Ellison J D Lueck H J Fromm 《Biochemical and biophysical research communications》1974,57(4):1214-1220
The binding of glucose to bovine brain hexokinase, isozyme I, exhibited one binding site per 100,000 molecular weight. Glucose-6-P binding was examined in the absence and presence of ATP. ATP and glucose-6-P were shown to compete for the same binding site on the enzyme. A model was proposed to account for these findings and the previously reported data that glucose-6-P and Pi exhibit mutually exclusive, non-cooperative binding to the enzyme. The model shows that brain hexokinase exists in two rapidly interconvertible states, either with or without Pi and that glucose-6-P binding to the phosphate associated enzyme form is relatively very poor. This proposal has been tested kinetically and the data appear to support the suggested model. 相似文献
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Panagiotou G Villas-Bôas SG Christakopoulos P Nielsen J Olsson L 《Journal of biotechnology》2005,115(4):425-434
The filamentous fungus Fusarium oxysporum is known for its ability to produce ethanol by simultaneous saccharification and fermentation (SSF) of cellulose. However, the conversion rate is low and significant amounts of acetic acid are produced as a by-product. In this study, the growth characteristics of F. oxysporum were evaluated in a minimal medium using glucose as the sole carbon source in aerobic, anaerobic and oxygen-limited batch cultivations. Under aerobic conditions the maximum specific growth rate was found to be 0.043 h(-1), and the highest ethanol yield (1.66 mol/mol) was found under anaerobic conditions. During the different phases of the cultivations, the intracellular profiles were determined under aerobic and anaerobic conditions. The profiles of the phosphorylated intermediates indicated that there was a high glycolytic flux at anaerobic growth conditions, characterized by high efflux of glyceraldehyde-3-phosphate (G3P) and fructose-6-phosphate (F6P) from the pentose phosphate pathway (PPP) to the Embden-Meyerhof-Parnas (EMP) pathway, resulting in the highest ethanol production under these conditions. The amino acid profile clearly suggests that the TCA cycle was primarily active under aerobic cultivation. On the other hand, the presence of high levels of gamma-amino-n-butyric acid (GABA) under anaerobic conditions suggests a functional GABA bypass and a possible block in the TCA cycle at these conditions. 相似文献